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United States of America
Flag Coat of arms
Motto: "In God We Trust" Other traditional mottos: "E pluribus unum" (Latin) "Out of many, one" "Annuit cœptis" (Latin) "Providence favors our undertakings" "Novus ordo seclorum" (Latin) "New order of the ages"
Anthem: "The Star-Spangled Banner"
Show globe (states and D.C. only)Show the U.S. and its territories
Capital	Washington, D.C. 38°53′N 77°01′W / 38.883°N 77.017°W / 38.883; -77.017
Largest city	New York City 40°43′N 74°00′W / 40.717°N 74.000°W / 40.717; -74.000
Official languages	None
National language	English (de facto)
Ethnic groups (2020)	By race: 61.6% White 12.4% Black 6% Asian 1.1% Native American 0.2% Pacific Islander 10.2% Multiracial 8.4% Others By Hispanic or Latino origin: 81.3% Non-Hispanic or Latino 18.7% Hispanic or Latino
Religion (2021)	63% Christian —40% Protestant —21% Catholic —2% Other Christian 29% None 6% Other 2% Unknown
Demonym(s)	American
Government	Federal presidential constitutional republic
• President	Joe Biden
• Vice President	Kamala Harris
• House Speaker	Nancy Pelosi
• Chief Justice	John Roberts
Legislature	Congress
• Upper house	Senate
• Lower house	House of Representatives
Independence from Great Britain
• Declaration	July 4, 1776 (1776-07-04)
• Confederation	March 1, 1781 (1781-03-01)
• Treaty of Paris	September 3, 1783 (1783-09-03)
• Constitution	June 21, 1788 (1788-06-21)
• Last state admitted	August 21, 1959 (1959-08-21)
Area
• Total area	3,796,742 sq mi (9,833,520 km) (3rd[c])
• Water (%)	4.66
• Land area	3,531,905 sq mi (9,147,590 km) (3rd)
Population
• 2021 estimate	331,893,745
• 2020 census	331,449,281 (3rd)
• Density	87/sq mi (33.6/km) (185th)
GDP (PPP)	2022 estimate
• Total	$25.35 trillion (2nd)
• Per capita	$76,027 (9th)
GDP (nominal)	2022 estimate
• Total	$25.35 trillion (1st)
• Per capita	$76,027 (8th)
Gini (2020)	46.9 high inequality
HDI (2021)	0.921 very high (21st)
Currency	U.S. dollar ($) (USD)
Time zone	UTC−4 to −12, +10, +11
• Summer (DST)	UTC−4 to −10
Date format	mm/dd/yyyy
Drives on	Right
Calling code	+1
ISO 3166 code	US

The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country in North America consisting of 50 states, a federal district, five major unincorporated territories, nine minor outlying islands, and 326 Indian reservations with limited sovereignty. It is the third-largest country by area and shares land borders with Canada to its north and with Mexico to its south, while maintaining maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 331 million, the U.S. is the third-most populous country in the world after China and India. The national capital is Washington, D.C., and the most populous city is New York City. The U.S. is a melting pot of cultures and ethnicities, and its population has been profoundly shaped by centuries of immigration. It also has a highly diverse climate and geography and is officially recognized as one of the 17 ecologically megadiverse countries.

Paleo-aboriginals migrated from Siberia to the North American mainland at least 12,000 years ago, and advanced cultures began to appear later on. These advanced cultures had almost completely declined by the time European colonists arrived during the 16th century. The United States emerged from the Thirteen British Colonies established along the East Coast when disputes with the British Crown over taxation and political representation led to the American Revolution (1765–1784), which established the nation's independence. In the late 18th century, the U.S. began expanding across North America, gradually obtaining new territories, sometimes through war, frequently displacing Native Americans, and admitting new states. By 1848, the country spanned the continent from east to west. Controversy surrounding the practice of slavery culminated in the secession of the Confederate States of America, which fought the remaining states of the Union during the American Civil War (1861–1865). With the Union's victory and preservation, slavery was abolished by the Thirteenth Amendment.

By 1900, the United States had become the world's largest economy, and the Spanish–American War and World War I established the country as a world power. After Japan's surprise attack on Pearl Harbor in 1941, the U.S. declared war on the Axis powers during World War II. The aftermath of the war left the U.S. and the Soviet Union as the world's two superpowers. During the Cold War, both countries engaged in a struggle for ideological dominance, but avoided direct military conflict. They also competed in the Space Race, which culminated in the 1969 American spaceflight that first landed humans on the Moon. Simultaneously, the civil rights movement led to legislation abolishing state and local Jim Crow laws and other codified racial discrimination against African Americans. The Soviet Union's dissolution in 1991 ended the Cold War, leaving the U.S. as the world's sole superpower. The September 11 attacks in 2001 resulted in the country launching wars happening in Afghanistan (2001–2021) and Iraq (2003–2011).

The United States is a federal republic with three separate branches of government, including a bicameral legislature. It is a liberal democracy and market economy; it ranks high in international measures of human rights, quality of life, income and wealth, economic competitiveness, and education; and it has low levels of perceived corruption. It has high levels of incarceration and inequality, retains capital punishment at the federal level (and in some states) and lacks universal health care.

The United States is a highly developed country, and its economy accounts for approximately a quarter of global GDP and is the world's largest by GDP at market exchange rates. By value, the U.S. is the world's largest importer and second-largest exporter. Although it accounts for just over 4.2% of the world's total population, the U.S. holds over 30% of the total wealth in the world, the largest share of any country. The United States is a founding member and seat of the United Nations, World Bank, International Monetary Fund, Organization of American States, NATO, and a permanent member of the United Nations Security Council. The country makes up more than a third of global military spending, is the foremost military power in the world, and is also a leading political, cultural, and scientific force.

Etymology

The first known use of the name "America" dates to 1507, when it appeared on a world map produced by the German cartographer Martin Waldseemüller in the French city of Saint-Dié-des-Vosges. On his map, the name is shown in large letters on what would now be considered South America, honoring Amerigo Vespucci. The Italian explorer was the first to postulate that the West Indies did not represent Asia's eastern limit but were part of a previously unknown landmass. In 1538, the Flemish cartographer Gerardus Mercator used the name "America" to the entire Western Hemisphere.

The first documentary evidence of the phrase "United States of America" dates from a January 2, 1776 letter written by Stephen Moylan to Joseph Reed, George Washington's aide-de-camp. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort. The first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, on April 6, 1776.

The second draft of the Articles of Confederation and Perpetual Union, prepared by John Dickinson and completed no later than June 17, 1776, declared "The name of this Confederation shall be the 'United States of America'." The final version of the Articles, sent to the states for ratification in late 1777, stated that "The Stile of this Confederacy shall be 'The United States of America'." In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence. This draft of the document did not surface until June 21, 1776, and it is unclear whether it was written before or after Dickinson used the term in his June 17 draft of the Articles of Confederation.

The phrase "United States" was originally plural in American usage. It described a collection of states—e.g., "the United States are..." The singular form became popular after the end of the Civil War and is now standard usage. A citizen of the United States is called an "American". "United States", "American", and "U.S." refer to the country adjectivally ("American values", "U.S. forces"). In English, the word "American" rarely refers to topics or subjects not directly connected with the United States.

History

Indigenous peoples and pre-Columbian history

It is generally accepted that the first inhabitants of North America migrated from Siberia by way of the Bering land bridge and arrived at least 12,000 years ago; however, some evidence suggests an even earlier date of arrival. The Clovis culture, which appeared around 11,000 BC, is believed to represent the first wave of human settlement of the Americas. This was likely the first of three major waves of migration into North America; later waves brought the ancestors of present-day Athabaskans, Aleuts, and Eskimos.

Over time, indigenous cultures in North America grew increasingly complex, and some, such as the pre-Columbian Mississippian culture in the southeast, developed advanced agriculture, architecture, and complex societies. The city-state of Cahokia is the largest, most complex pre-Columbian archaeological site in the modern-day United States. In the Four Corners region, Ancestral Puebloan culture developed from centuries of agricultural experimentation. The Haudenosaunee, located in the southern Great Lakes region, was established at some point between the twelfth and fifteenth centuries. Most prominent along the Atlantic coast were the Algonquian tribes, who practiced hunting and trapping, along with limited farming.

Estimating the native population of North America during European contact is difficult. Douglas H. Ubelaker of the Smithsonian Institution estimated a population of 93 thousand in the South Atlantic states and a population of 473 thousand in the Gulf states, but most academics regard this figure as too low. Anthropologist Henry F. Dobyns believed the populations were much higher, suggesting around 1.1 million along the shores of the Gulf of Mexico, 2.2 million people living between Florida and Massachusetts, 5.2 million in the Mississippi Valley and tributaries, and around 700,000 people in the Florida peninsula.

European settlements

Claims of very early colonization of coastal New England by the Norse are disputed and controversial. The first documented arrival of Europeans in the continental United States is that of Spanish conquistadors such as Juan Ponce de León, who made his first expedition to Florida in 1513. Even earlier, Christopher Columbus had landed in Puerto Rico on his 1493 voyage, and San Juan was settled by the Spanish a decade later. The Spanish set up the first settlements in Florida and New Mexico, such as Saint Augustine, often considered the nation's oldest city, and Santa Fe. The French established their own settlements along the Mississippi River, notably New Orleans.

Successful English settlement of the eastern coast of North America began with the Virginia Colony in 1607 at Jamestown and with the Pilgrims' colony at Plymouth in 1620. The continent's first elected legislative assembly, Virginia's House of Burgesses, was founded in 1619. Documents such as the Mayflower Compact and the Fundamental Orders of Connecticut established precedents for representative self-government and constitutionalism that would develop throughout the American colonies. Many English settlers were dissenting Christians who came seeking religious freedom. In 1784, the Russians were the first Europeans to establish a settlement in Alaska, at Three Saints Bay. The native population of America declined after European arrival for various reasons, primarily from diseases such as smallpox and measles.

In the early days of colonization, many European settlers were subject to food shortages, disease, and attacks from Native Americans. Native Americans were also often fighting neighboring tribes and European settlers. In many cases, however, the natives and settlers came to depend on each other. Settlers traded for food and animal pelts; natives for guns, tools, and other European goods. Natives taught many settlers to cultivate corn, beans, and other foodstuffs. European missionaries and others felt it was important to "civilize" the Native Americans and urged them to adopt European agricultural practices and lifestyles. However, with the increased European colonization of North America, Native Americans were displaced and often killed during conflicts.

European settlers also began trafficking African slaves into Colonial America via the transatlantic slave trade. Because of a lower prevalence of tropical diseases and better treatment, slaves had a much higher life expectancy in North America than in South America, leading to a rapid increase in their numbers. Colonial society was largely divided over the religious and moral implications of slavery, and several colonies passed acts for or against the practice. However, by the turn of the 18th century, African slaves had supplanted European indentured servants as cash crop labor, especially in the American South.

The Thirteen Colonies that would become the United States of America were administered by the British as overseas dependencies. All nonetheless had local governments with elections open to most free men. With very high birth rates, low death rates, and steady settlement, the colonial population grew rapidly, eclipsing Native American populations. The Christian revivalist movement of the 1730s and 1740s known as the Great Awakening fueled interest both in religion and in religious liberty.

During the Seven Years' War (1756–1763), known in the U.S. as the French and Indian War, British forces captured Canada from the French. With the creation of the Province of Quebec, Canada's francophone population would remain isolated from the English-speaking colonial dependencies of Nova Scotia, Newfoundland and the Thirteen Colonies. Excluding the Native Americans who lived there, the Thirteen Colonies had a population of over 2.1 million in 1770, about a third that of Britain. Despite continuing new arrivals, the rate of natural increase was such that by the 1770s only a small minority of Americans had been born overseas. The colonies' distance from Britain had allowed the development of self-government, but their unprecedented success motivated British monarchs to periodically seek to reassert royal authority.

Independence and expansion

The American Revolutionary War fought by the Thirteen Colonies against the British Empire was the first successful war of independence by a non-European entity against a European power in modern history. Americans had developed an ideology of "republicanism", asserting that government rested on the will of the people as expressed in their local legislatures. They demanded their "rights as Englishmen" and "no taxation without representation". The British insisted on administering the empire through Parliament, and the conflict escalated into war.

In 1774, the First Continental Congress passed the Continental Association, which mandated a colony-wide boycott of British goods. The Revolutionary War began the following year, catalyzed by events like the Stamp Act and the Boston Tea Party that were rooted in colonial disagreement with British policies. A celebrated early turn in the war for the colonial revolutionists was George Washington leading the charge to cross the frozen Delaware River in a surprise overnight attack on Christmas 1775. The Second Continental Congress, an assembly representing the United Colonies, unanimously adopted the Declaration of Independence on July 4, 1776 (annually celebrated as Independence Day). In 1781, the Articles of Confederation and Perpetual Union established a decentralized government that operated until 1789.

After its defeat at the siege of Yorktown in 1781, Britain signed a peace treaty.

American sovereignty became internationally recognized, and the country was granted all lands east of the Mississippi River.

Nationalists led the Philadelphia Convention of 1787 in writing the United States Constitution, ratified in state conventions in 1788. Going into force in 1789, this constitution reorganized the federal government into three branches, on the principle of creating salutary checks and balances. George Washington, who had led the Continental Army to victory, was the first president elected under the new constitution. The Bill of Rights, forbidding federal restriction of personal freedoms and guaranteeing a range of legal protections, was adopted in 1791.

Tensions with Britain remained, however, leading to the War of 1812, which was fought to a draw.

Although the federal government outlawed American participation in the Atlantic slave trade in 1807, after 1820, cultivation of the highly profitable cotton crop exploded in the Deep South, and along with it, the slave population. The Second Great Awakening, especially in the period 1800–1840, converted millions to evangelical Protestantism. In the North, it energized multiple social reform movements, including abolitionism; in the South, Methodists and Baptists proselytized among slave populations.

Beginning in the late 18th century, American settlers began to expand westward, prompting a long series of American Indian Wars.

The 1803 Louisiana Purchase nearly doubled the nation's area, Spain ceded Florida and other Gulf Coast territory in 1819, the Republic of Texas was annexed in 1845 during a period of expansionism, and the 1846 Oregon Treaty with Britain led to U.S. control of the present-day American Northwest. Victory in the Mexican–American War resulted in the 1848 Mexican Cession of California and much of the present-day American Southwest, making the U.S. span the continent.

The California Gold Rush of 1848–1849 spurred migration to the Pacific coast, which led to the California Genocide and the creation of additional western states. Economic development was spurred by giving vast quantities of land, nearly 10% of the total area of the United States, to white European settlers as part of the Homestead Acts, as well as making land grants to private railroad companies and colleges. After the Civil War, new transcontinental railways made relocation easier for settlers, expanded internal trade, and increased conflicts with Native Americans.

Civil War and Reconstruction era

Irreconcilable sectional conflict regarding the enslavement of Africans and African Americans ultimately led to the American Civil War. With the 1860 election of Republican Abraham Lincoln, conventions in thirteen slave states declared secession and formed the Confederate States of America (the "South" or the "Confederacy"), while the federal government (the "Union") maintained that secession was illegal. In order to bring about this secession, military action was initiated by the secessionists, and the Union responded in kind. The ensuing war would become the deadliest military conflict in American history, resulting in the deaths of approximately 620,000 soldiers as well as upwards of 50,000 civilians.

Reconstruction began in earnest following the war. While President Lincoln attempted to foster friendship and forgiveness between the Union and the former Confederacy, his assassination on April 14, 1865 drove a wedge between North and South again. Republicans in the federal government made it their goal to oversee the rebuilding of the South and to ensure the rights of African Americans. They persisted until the Compromise of 1877 when the Republicans agreed to cease protecting the rights of African Americans in the South in order for Democrats to concede the presidential election of 1876. Southern white Democrats, calling themselves "Redeemers", took control of the South after the end of Reconstruction, beginning the nadir of American race relations. From 1890 to 1910, the Redeemers established so-called Jim Crow laws, disenfranchising most blacks and some impoverished whites throughout the region. Blacks would face racial segregation nationwide, especially in the South. They also occasionally experienced vigilante violence, including lynching.

Further immigration, expansion, and industrialization

In the North, urbanization and an unprecedented influx of immigrants from Southern and Eastern Europe supplied a surplus of labor for the country's industrialization and transformed its culture. National infrastructure, including telegraph and transcontinental railroads, spurred economic growth and greater settlement and development of the American Old West. The later invention of electric light and the telephone would also affect communication and urban life.

The United States fought Indian Wars west of the Mississippi River from 1810 to at least 1890. Most of these conflicts ended with the cession of Native American territory and their confinement to Indian reservations. Additionally, the Trail of Tears in the 1830s exemplified the Indian removal policy that forcibly resettled Indians. This further expanded acreage under mechanical cultivation, increasing surpluses for international markets. Mainland expansion also included the purchase of Alaska from Russia in 1867. In 1893, pro-American elements in Hawaii overthrew the Hawaiian monarchy and formed the Republic of Hawaii, which the U.S. annexed in 1898. Puerto Rico, Guam, and the Philippines were ceded by Spain in the same year, following the Spanish–American War. American Samoa was acquired by the United States in 1900 after the end of the Second Samoan Civil War. The U.S. Virgin Islands were purchased from Denmark in 1917.

Rapid economic development during the late 19th and early 20th centuries fostered the rise of many prominent industrialists. Tycoons like Cornelius Vanderbilt, John D. Rockefeller, and Andrew Carnegie led the nation's progress in the railroad, petroleum, and steel industries. Banking became a major part of the economy, with J. P. Morgan playing a notable role. The American economy boomed, becoming the world's largest. These dramatic changes were accompanied by growing inequality and social unrest, which prompted the rise of organized labor along with populist, socialist, and anarchist movements. This period eventually ended with the advent of the Progressive Era, which saw significant reforms including women's suffrage, alcohol prohibition, regulation of consumer goods, and greater antitrust measures to ensure competition and attention to worker conditions.

World War I, Great Depression, and World War II

The United States remained neutral from the outbreak of World War I in 1914 until 1917 when it joined the war as an "associated power" alongside the Allies of World War I, helping to turn the tide against the Central Powers. In 1919, President Woodrow Wilson took a leading diplomatic role at the Paris Peace Conference and advocated strongly for the U.S. to join the League of Nations. However, the Senate refused to approve this and did not ratify the Treaty of Versailles that established the League of Nations.

In 1920, the women's rights movement won passage of a constitutional amendment granting women's suffrage. The 1920s and 1930s saw the rise of radio for mass communication and the invention of early television. The prosperity of the Roaring Twenties ended with the Wall Street Crash of 1929 and the onset of the Great Depression. The Empire State Building was the world's tallest skyscraper when it opened in 1931, during the Depression era. At that same time, the United States Congress adopted The Star-Spangled Banner as the country's official national anthem. After his election as president in 1932, Franklin D. Roosevelt responded with the New Deal. The Great Migration of millions of African Americans out of the American South began before World War I and extended through the 1960s; whereas the Dust Bowl of the mid-1930s impoverished many farming communities and spurred a new wave of western migration.

At first neutral during World War II, the United States in March 1941 began supplying materiel to the Allies. On December 7, 1941, the Empire of Japan launched a surprise attack on Pearl Harbor, prompting the United States to join the Allies against the Axis powers, and in the following year, to intern about 120,000 Japanese and Japanese Americans. The U.S. pursued a "Europe first" defense policy, leaving the Philippines, an American colony, isolated and alone to fight Japan's invasion and occupation until the U.S.-led Philippines campaign (1944–1945). During the war, the United States was one of the "Four Powers" who met to plan the postwar world, along with Britain, the Soviet Union, and China. The United States emerged relatively unscathed from the war, and with even greater economic and military influence.

The United States played a leading role in the Bretton Woods and Yalta conferences, which signed agreements on new international financial institutions and Europe's postwar reorganization. As an Allied victory was won in Europe, a 1945 international conference held in San Francisco produced the United Nations Charter, which became active after the war. The United States and Japan then fought each other in the largest naval battle in history, the Battle of Leyte Gulf. The United States developed the first nuclear weapons and used them on Japan in the cities of Hiroshima and Nagasaki in August 1945; the Japanese surrendered on September 2, ending World War II.

Cold War and late 20th century

After World War II, the United States financed and implemented the Marshall Plan to help rebuild western Europe; disbursements paid between 1948 and 1952 would total $13 billion ($115 billion in 2021). Meanwhile, geopolitical tensions between the United States and Soviet Union led to the Cold War, driven by an ideological divide between capitalism and communism. They dominated the military affairs of Europe, with the U.S. and its NATO allies on one side and the Soviet Union and its Warsaw Pact allies on the other. The U.S. often opposed Third World movements that it viewed as Soviet-sponsored, sometimes pursuing direct action for regime change against left-wing governments. American troops fought the communist forces in the Korean War of 1950–53, and the U.S. became increasingly involved in the Vietnam War (1955–1975), introducing combat forces in 1965. Their competition to achieve superior spaceflight capability led to the Space Race, which culminated in the U.S. becoming the first nation to land people on the Moon in 1969. While both countries engaged in proxy wars and developed powerful nuclear weapons, they avoided direct military conflict.

At home, the U.S. had experienced sustained economic expansion, urbanization, and a rapid growth of its population and middle class following World War II. After a surge in female labor participation around the 1970s, by 1985, the majority of women aged 16 and over were employed, and construction of an Interstate Highway System transformed the nation's transportation infrastructure in decades to come. In 1959, the United States admitted Alaska and Hawaii to become the 49th and 50th states, formally expanding beyond the contiguous United States.

The growing civil rights movement used nonviolence to confront racism, with Martin Luther King Jr. becoming a prominent leader and figurehead. A combination of court decisions and legislation, culminating in the Civil Rights Act of 1968, sought to end racial discrimination. Meanwhile, a counterculture movement grew, which was fueled by opposition to the Vietnam War, the Black Power movement, and the sexual revolution. The women's movement in the U.S. broadened the debate on women's rights and made gender equality a major social goal. The 1969 Stonewall riots in New York City marked the beginning of the fledgling gay rights movement. The launch of a "War on Poverty" expanded entitlements and welfare spending, leading to the creation of the Food Stamp Program, Aid to Families with Dependent Children, along with national health insurance programs Medicare and Medicaid. Four prominent American politicians and social activists were assassinated during the 1960s: President John F. Kennedy in 1963 and his brother Robert F. Kennedy in 1968, Malcolm X in 1965, and Martin Luther King Jr. in 1968. Public trust in the federal government further decreased in response to President Richard Nixon’s Watergate scandal, which began in 1972 and ended in 1974 when Nixon became the only U.S. president to resign from office.

The 1970s and early 1980s saw the onset of stagflation. The United States supported Israel during the Yom Kippur War; in response, the country faced an oil embargo from OPEC nations, sparking the 1973 oil crisis. After his election, President Ronald Reagan responded to economic stagnation with free market-oriented reforms and initiated the more aggressive rollback strategy towards the Soviet Union. The dissolution of the Soviet Union in 1991 ended the Cold War, ensuring a global unipolarity in which the U.S. was unchallenged as the world's dominant superpower.

Due to the dot-com boom, stable monetary policy, and reduced social welfare spending, the 1990s saw the longest economic expansion in modern U.S. history. Fearing the spread of instability from the Iraqi invasion of Kuwait, in August 1991, President George H. W. Bush launched and led the Gulf War against Iraq, expelling Iraqi forces and restoring the Kuwaiti monarchy. Beginning in 1994, the U.S. signed the North American Free Trade Agreement (NAFTA), causing trade among the U.S., Canada, and Mexico to soar.

21st century

On September 11, 2001, al-Qaeda terrorist hijackers flew passenger planes into the World Trade Center in New York City and the Pentagon near Washington, D.C., killing nearly 3,000 people. In response, President George W. Bush launched the War on Terror, which included a nearly 20-year war in Afghanistan from 2001 to 2021 and the 2003–2011 Iraq War. Government policy designed to promote affordable housing, widespread failures in corporate and regulatory governance, and historically low interest rates set by the Federal Reserve led to a housing bubble in 2006. This culminated in the financial crisis of 2007–2008 and the Great Recession, the nation's largest economic contraction since the Great Depression.

Barack Obama, the first multiracial president, with African-American ancestry was elected in 2008 amid the crisis. After Obama served two terms, Republican Donald Trump was elected as the 45th president in 2016 and led the country through the first waves of the COVID-19 pandemic in the United States. His election is viewed as one of the biggest political upsets in American history. The murder of George Floyd in 2020 sparked widespread civil unrest in urban centers and a debate about police brutality nationwide. On January 6, 2021, supporters of outgoing Trump stormed the U.S. Capitol in an unsuccessful effort to disrupt the presidential Electoral College vote count that confirmed Democrat Joe Biden as 46th president.

Geography

The 48 contiguous states and the District of Columbia occupy a combined area of 3,119,885 square miles (8,080,470 km). Of this area, 2,959,064 square miles (7,663,940 km) is contiguous land, composing 83.65% of total U.S. land area. About 15% is occupied by Alaska, a state in northwestern North America, with the remainder in Hawaii, a state and archipelago in the central Pacific, and the five populated but unincorporated insular territories of Puerto Rico, American Samoa, Guam, the Northern Mariana Islands, and the U.S. Virgin Islands. Measured by only land area, the United States is third in size behind Russia and China, and just ahead of Canada.

The United States is the world's third- or fourth-largest nation by total area (land and water), ranking behind Russia and Canada and nearly equal to China. The ranking varies depending on how two territories disputed by China and India are counted, and how the total size of the United States is measured.

The coastal plain of the Atlantic seaboard gives way further inland to deciduous forests and the rolling hills of the Piedmont. The Appalachian Mountains divide the eastern seaboard from the Great Lakes and the grasslands of the Midwest. The Mississippi–Missouri River, the world's fourth longest river system, runs mainly north–south through the heart of the country. The flat, fertile prairie of the Great Plains stretches to the west, interrupted by a highland region in the southeast.

The Rocky Mountains, west of the Great Plains, extend north to south across the country, peaking around 14,000 feet (4,300 m) in Colorado. Farther west are the rocky Great Basin and deserts such as the Chihuahua, Sonoran and Mojave. The Sierra Nevada and Cascade mountain ranges run close to the Pacific coast, both ranges reaching altitudes higher than 14,000 feet (4,300 m). The lowest and highest points in the contiguous United States are in the state of California, and only about 84 miles (135 km) apart. At an elevation of 20,310 feet (6,190.5 m), Alaska's Denali is the highest peak in the country and in North America. Active volcanoes are common throughout Alaska's Alexander and Aleutian Islands, and Hawaii consists of volcanic islands. The supervolcano underlying Yellowstone National Park in the Rockies is the continent's largest volcanic feature.

Climate

The United States, with its large size and geographic variety, includes most climate types. To the east of the 100th meridian, the climate ranges from humid continental in the north to humid subtropical in the south.

The Great Plains west of the 100th meridian are semi-arid. Many mountainous areas of the American West have an alpine climate. The climate is arid in the Great Basin, desert in the Southwest, Mediterranean in coastal California, and oceanic in coastal Oregon and Washington and southern Alaska. Most of Alaska is subarctic or polar. Hawaii and the southern tip of Florida are tropical, as well as its territories in the Caribbean and the Pacific.

States bordering the Gulf of Mexico are prone to hurricanes, and most of the world's tornadoes occur in the country, mainly in Tornado Alley areas in the Midwest and South. Overall, the United States receives more high-impact extreme weather incidents than any other country in the world.

Extreme weather has become more frequent in the U.S., with three times the number of reported heat waves as in the 1960s. Of the ten warmest years ever recorded in the 48 contiguous states, eight have occurred since 1998. In the American Southwest, droughts have become more persistent and more severe.

Biodiversity and conservation

The U.S. is one of 17 megadiverse countries containing large numbers of endemic species: about 17,000 species of vascular plants occur in the contiguous United States and Alaska, and more than 1,800 species of flowering plants are found in Hawaii, few of which occur on the mainland. The United States is home to 428 mammal species, 784 birds, 311 reptiles, and 295 amphibians, and 91,000 insect species.

There are 63 national parks and hundreds of other federally managed parks, forests, and wilderness areas, which are managed by the National Park Service. Altogether, the government owns about 28% of the country's land area, mostly in the western states. Most of this land is protected, though some is leased for oil and gas drilling, mining, logging, or cattle ranching, and about .86% is used for military purposes.

Environmental issues include debates on oil and nuclear energy, dealing with air and water pollution, the economic costs of protecting wildlife, logging and deforestation, and climate change. The most prominent environmental agency is the Environmental Protection Agency (EPA), created by presidential order in 1970. The idea of wilderness has shaped the management of public lands since 1964, with the Wilderness Act. The Endangered Species Act of 1973 is intended to protect threatened and endangered species and their habitats, which are monitored by the United States Fish and Wildlife Service.

As of 2020, the U.S. ranked 24th among nations in the Environmental Performance Index. The country joined the Paris Agreement on climate change in 2016, and has many other environmental commitments. It withdrew from the Paris Agreement in 2020 but rejoined it in 2021.

Government and politics

The three branches of the United States government

	Executive branch	Judicial branch	Legislative branch
Overview	Executive: The president is the commander-in-chief of the military, can veto legislative bills before they become law (subject to congressional override), and appoints the members of the Cabinet (subject to Senate approval) and other officers, who administer and enforce federal laws and policies.	Judicial: The Supreme Court and lower federal courts, whose judges are appointed by the president with Senate approval, interpret laws and overturn those they find unconstitutional.	Legislative: The bicameral Congress, made up of the Senate and the House of Representatives, makes federal law, declares war, approves treaties, has the power of the purse, and has the power of impeachment, by which it can remove sitting members of the federal government.
Details	The president serves a four-year term and may be elected to the office no more than twice. The president is not elected by direct vote, but by an indirect electoral college system in which the determining votes are apportioned to the states and the District of Columbia.	The Supreme Court, led by the chief justice of the United States, has nine members, who serve for life. All laws and governmental procedures are subject to judicial review, and any law can be voided if the courts determine that it violates the Constitution. The principle of judicial review, not explicitly mentioned in the Constitution, was established by the Supreme Court in Marbury v. Madison (1803).	The lower house, the House of Representatives, has 435 voting members, each representing a congressional district for a two-year term. House seats are apportioned among the states by population. The District of Columbia and the five major U.S. territories each have one non-voting House member but no Senators. The upper house, the Senate, has 100 members with each state having two senators, elected at large to six-year terms.
Head-quarters
Leader title		Chief Justice of the United States
Incumbent

The United States is a federal republic of 50 states, a federal district, five territories and several uninhabited island possessions. It is the world's oldest surviving federation. It is a federal republic and a representative democracy "in which majority rule is tempered by minority rights protected by law." In the American federalist system, citizens are subjected to three levels of government: federal, state, and local. The government is regulated by a system of checks and balances defined by the U.S. Constitution, which serves as the country's supreme legal document. The Constitution establishes the structure and responsibilities of the federal government and its relationship with the individual states. The Constitution has been amended 27 times; the first ten amendments (Bill of Rights) and the Fourteenth Amendment form the central basis of Americans' individual rights.

The United States has operated under a two-party system for most of its history. In American political culture, the center-right Republican Party is considered "conservative" and the center-left Democratic Party is considered "liberal". On Transparency International's 2019 Corruption Perceptions Index, its public sector position deteriorated from a score of 76 in 2015 to 69 in 2019. In 2021, the U.S. ranked 26th on the Democracy Index, and is described as a "flawed democracy".

Political divisions

Each of the 50 states holds jurisdiction over a geographic territory, where it shares sovereignty with the federal government. They are subdivided into counties or county equivalents, and further divided into municipalities. The District of Columbia is a federal district that contains the capital of the United States, the city of Washington. Each state has the amount presidential electors equal to the number of their representatives plus senators in Congress, and District of Columbia has three electors. Territories of the United States do not have presidential electors, therefore people there cannot vote for the president.

Citizenship is granted at birth in all states, the District of Columbia, and all major U.S. territories except American Samoa. The United States observes limited tribal sovereignty of the American Indian nations, like states' sovereignty. American Indians are U.S. citizens and tribal lands are subject to the jurisdiction of the U.S. Congress and the federal courts. Like the states, tribes have some autonomy restrictions. They are prohibited from making war, engaging in their own foreign relations, and printing or issuing independent currency. Indian reservations are usually contained within one state, but there are 12 reservations that cross state boundaries; the largest concentration of Native American reservations is in the state of Arizona.

Foreign relations

The United States has an established structure of foreign relations, and it had the world's second-largest diplomatic corps in 2019. It is a permanent member of the United Nations Security Council, and home to the United Nations headquarters. The United States is also a member of the G7, G20, and OECD intergovernmental organizations. Almost all countries have embassies and many have consulates (official representatives) in the country. Likewise, nearly all nations host formal diplomatic missions with United States, except Iran, North Korea, and Bhutan. Though Taiwan does not have formal diplomatic relations with the U.S., it maintains close, if unofficial, relations. The United States also regularly supplies Taiwan with military equipment.

The United States has a "Special Relationship" with the United Kingdom and strong ties with Canada, Australia, New Zealand, the Philippines, Japan, South Korea, Israel, and several European Union countries (France, Italy, Germany, Spain, and Poland). The U.S. works closely with its NATO allies on military and national security issues, and with nations in the Americas through the Organization of American States and the United States–Mexico–Canada Free Trade Agreement. In South America, Colombia is traditionally considered to be the closest ally of the United States. The U.S. exercises full international defense authority and responsibility for Micronesia, the Marshall Islands and Palau through the Compact of Free Association. In the 21st century, U.S. relations with Russia and China have deteriorated significantly.

Military

The president is the commander-in-chief of the United States Armed Forces and appoints its leaders, the secretary of defense and the Joint Chiefs of Staff. The Department of Defense, which is headquartered at the Pentagon near Washington, D.C., administers five of the six service branches, which are made up of the Army, Marine Corps, Navy, Air Force, and Space Force. The Coast Guard is administered by the Department of Homeland Security in peacetime and can be transferred to the Department of the Navy in wartime. The United States spent $649 billion on its military in 2019, 36% of global military spending. At 4.7% of GDP, the percentage was the second-highest among all countries, after Saudi Arabia. It also has more than 40% of the world's nuclear weapons, the second-largest after Russia.

In 2019, all six branches of the U.S. Armed Forces reported 1.4 million personnel on active duty. The Reserves and National Guard brought the total number of troops to 2.3 million. The Department of Defense also employed about 700,000 civilians, not including contractors. Military service in the United States is voluntary, although conscription may occur in wartime through the Selective Service System. The United States has the third-largest combined armed forces in the world, behind the Chinese People's Liberation Army and Indian Armed Forces.

Today, American forces can be rapidly deployed by the Air Force's large fleet of transport aircraft, the Navy's 11 active aircraft carriers, and Marine expeditionary units at sea with the Navy, and Army's XVIII Airborne Corps and 75th Ranger Regiment deployed by Air Force transport aircraft. The Air Force can strike targets across the globe through its fleet of strategic bombers, maintains the air defense across the United States, and provides close air support to Army and Marine Corps ground forces. The Space Force operates the Global Positioning System, operates the Eastern and Western Ranges for all space launches, and operates the United States' Space Surveillance and Missile Warning networks. The military operates about 800 bases and facilities abroad, and maintains deployments greater than 100 active duty personnel in 25 foreign countries.

Law enforcement and crime

There are about 18,000 U.S. police agencies from the local to the federal level in the United States. Law in the United States is mainly enforced by local police departments and sheriff's offices. State police agencies provide broader services, and federal agencies such as the Federal Bureau of Investigation (FBI) and the U.S. Marshals Service have specialized duties, such as protecting civil rights, national security and enforcing U.S. federal courts' rulings and federal laws. State courts conduct most civil and criminal trials, and federal courts handle designated crimes and appeals from the state criminal courts.

As of 2020, the United States has an intentional homicide rate of 7 per 100,000 people. A cross-sectional analysis of the World Health Organization Mortality Database from 2010 showed that United States homicide rates "were 7.0 times higher than in other high-income countries, driven by a gun homicide rate that was 25.2 times higher."

The United States has the highest documented incarceration rate and largest prison population in the world. In 2019, the total prison population for those sentenced to more than a year is 1,430,800, corresponding to a ratio of 419 per 100,000 residents and the lowest since 1995. Some estimates place that number higher, such Prison Policy Initiative's 2.3 million. Various states have attempted to reduce their prison populations via government policies and grassroots initiatives.

Although most nations have abolished capital punishment, it is sanctioned in the United States for certain federal and military crimes, and at the state level in 28 states, though three states have moratoriums on carrying out the penalty imposed by their governors. Since 1977, there have been more than 1,500 executions, giving the U.S. the sixth-highest number of known executions in the world, following China, Iran, Saudi Arabia, Iraq, and Egypt. However, the number is trended down nationally, with several states recently abolishing the penalty.

Economy

According to the International Monetary Fund, the U.S. gross domestic product (GDP) of $22.7 trillion constitutes 24% of the gross world product at market exchange rates and over 16% of the gross world product at purchasing power parity (PPP). From 1983 to 2008, U.S. real compounded annual GDP growth was 3.3%, compared to a 2.3% weighted average for the rest of the G7. The country ranks fifth in the world in nominal GDP per capita and seventh in GDP per capita at PPP. The country has been the world's largest economy since at least 1900.

The United States is the most technologically powerful and innovative nation, especially in artificial intelligence, computers, pharmaceuticals, and medical, aerospace, and military equipment. The nation's economy is fueled by abundant natural resources, a well-developed infrastructure, and high productivity. It has the second-highest total-estimated value of natural resources, valued at US$ 44.98 trillion in 2019, although sources differ on their estimates. Americans have the highest average household and employee income among OECD member states. In 2013, they had the sixth-highest median household income, down from fourth-highest in 2010.

The U.S. dollar is the currency most used in international transactions and is the world's foremost reserve currency, backed by its economy, its military, the petrodollar system and its linked eurodollar and large U.S. treasuries market. Several countries use it as their official currency and in others it is the de facto currency. The New York Stock Exchange and Nasdaq are the world's largest stock exchanges by market capitalization and trade volume.

The largest U.S. trading partners are China, the European Union, Canada, Mexico, India, Japan, South Korea, the United Kingdom, and Taiwan. The U.S. is the world's largest importer and the second-largest exporter. It has free trade agreements with several countries, including the USMCA. The U.S. ranked second in the Global Competitiveness Report in 2019, after Singapore. Of the world's 500 largest companies, 121 are headquartered in the U.S.

While its economy has reached a post-industrial level of development, the United States remains an industrial power. It has a smaller welfare state and redistributes less income through government action than most other high-income countries. The United States ranked the 41st-highest in income inequality among 156 countries in 2017, and the highest compared to the rest of the developed world. On February 2, 2022, the United States had a national debt of $30 trillion.

Income and poverty

Accounting for 4.24% of the global population, Americans collectively possess 30.2% of the world's total wealth as of 2021, the largest percentage of any country. The U.S. also ranks first in the number of dollar billionaires and millionaires in the world, with 724 billionaires (as of 2021) and nearly 22 million millionaires (2021). Wealth in the United States is highly concentrated; the richest 10% of the adult population own 72% of the country's household wealth, while the bottom 50% own just 2%. Income inequality in the U.S. remains at record highs, with the top fifth of earners taking home more than half of all income and giving the U.S. one of the widest income distributions among OECD members.

The United States is the only advanced economy that does not guarantee its workers paid vacation and is one of a few countries in the world without paid family leave as a legal right. The United States also has a higher percentage of low-income workers than almost any other developed nation, largely because of a weak collective bargaining system and lack of government support for at-risk workers.

There were about 567,715 sheltered and unsheltered homeless persons in the U.S. in January 2019, with almost two-thirds staying in an emergency shelter or transitional housing program. Attempts to combat homelessness include the Section 8 housing voucher program and implementation of the Housing First strategy across all levels of government. In 2011, 16.7 million children lived in food-insecure households, about 35% more than 2007 levels, though only 845,000 U.S. children (1.1%) saw reduced food intake or disrupted eating patterns at some point during the year, and most cases were not chronic. As of June 2018, 40 million people, roughly 12.7% of the U.S. population, were living in poverty, including 13.3 million children. Of those impoverished, 18.5 million live in "deep poverty", family income below one-half of the federal government's poverty threshold.

Science, technology, and energy

The United States has been a leader in technological innovation since the late 19th century and scientific research since the mid-20th century. Methods for producing interchangeable parts and the establishment of a machine tool industry enabled the U.S. to have large-scale manufacturing of sewing machines, bicycles, and other items in the late 19th century. In the early 20th century, factory electrification, introduction of the assembly line and other labor-saving techniques created the system of mass production. In the 21st century, approximately two-thirds of research and development funding comes from the private sector. In 2020, the United States was the country with the second-highest number of published scientific papers and second most patents granted, both after China. In 2021, the United States launched a total of 51 spaceflights. (China reported 55.) The U.S. had 2,944 active satellites in space in December 2021, the highest number of any country.

In 1876, Alexander Graham Bell was awarded the first U.S. patent for the telephone. Thomas Edison's research laboratory developed the phonograph, the first long-lasting light bulb, and the first viable movie camera. The Wright brothers in 1903 made the first sustained and controlled heavier-than-air powered flight, and the automobile companies of Ransom E. Olds and Henry Ford popularized the assembly line in the early 20th century. The rise of fascism and Nazism in the 1920s and 30s led many European scientists, such as Albert Einstein, Enrico Fermi, and John von Neumann, to immigrate to the United States. During World War II, the Manhattan Project developed nuclear weapons, ushering in the Atomic Age. During the Cold War, competition for superior missile capability ushered in the Space Race between the U.S. and Soviet Union. The invention of the transistor in the 1950s, a key component in almost all modern electronics, led to the development of microprocessors, software, personal computers and the Internet.

As of 2019, the United States receives approximately 80% of its energy from fossil fuels. In 2019, the largest source of the country's energy came from petroleum (36.6%), followed by natural gas (32%), coal (11.4%), renewable sources (11.4%) and nuclear power (8.4%). Americans constitute less than 5% of the world's population, but consume 17% of the world's energy. They account for about 25% of the world's petroleum consumption, while producing only 6% of the world's annual petroleum supply. The U.S. ranks as second-highest emitter of greenhouse gases, exceeded only by China.

Transportation

The United States' rail network, nearly all standard gauge, is the longest in the world, and exceeds 293,564 km (182,400 mi). It handles mostly freight, with intercity passenger service provided by Amtrak to all but four states. The country's inland waterways are the world's fifth-longest, and total 41,009 km (25,482 mi).

Personal transportation is dominated by automobiles, which operate on a network of 4 million miles (6.4 million kilometers) of public roads. The United States has the world's second-largest automobile market, and has the highest vehicle ownership per capita in the world, with 816.4 vehicles per 1,000 Americans (2014). In 2017, there were 255 million non-two wheel motor vehicles, or about 910 vehicles per 1,000 people.

The civil airline industry is entirely privately owned and has been largely deregulated since 1978, while most major airports are publicly owned. The three largest airlines in the world by passengers carried are U.S.-based; American Airlines is number one after its 2013 acquisition by US Airways. Of the world's 50 busiest passenger airports, 16 are in the United States, including the busiest, Hartsfield–Jackson Atlanta International Airport. Of the fifty busiest container ports, four are located in the United States, of which the busiest is the Port of Los Angeles.

Demographics

Population

Racial and ethnic groups in the United States (2020 Census)

The U.S. Census Bureau reported 331,449,281 residents as of April 1, 2020, making the United States the third most populous nation in the world, after China and India. According to the Bureau's U.S. Population Clock, on January 28, 2021, the U.S. population had a net gain of one person every 100 seconds, or about 864 people per day. In 2018, 52% of Americans age 15 and over were married, 6% were widowed, 10% were divorced, and 32% had never been married. In 2020, the U.S. had a total fertility rate stood at 1.64 children per woman and the world's highest rate (23%) of children living in single-parent households.

The United States of America has a diverse population; 37 ancestry groups have more than one million members. White Americans of European ancestry form the largest racial and ethnic group at 57.8% of the United States population. Hispanic and Latino Americans form the second-largest group and are 18.7% of the United States population. African Americans constitute the nation's third-largest ancestry group and are 12.1% of the total United States population. Asian Americans are the country's fourth-largest group, composing 5.9% of the United States population, while the country's 3.7 million Native Americans account for about 1%. In 2020, the median age of the United States population was 38.5 years.

In 2018, there were almost 90 million immigrants and U.S.-born children of immigrants in the United States, accounting for 28% of the overall U.S. population. In 2017, out of the U.S. foreign-born population, some 45% (20.7 million) were naturalized citizens, 27% (12.3 million) were lawful permanent residents, 6% (2.2 million) were temporary lawful residents, and 23% (10.5 million) were unauthorized immigrants. The United States led the world in refugee resettlement for decades, admitting more refugees than the rest of the world combined.

Language

English (specifically, American English) is the de facto national language of the United States. Although there is no official language at the federal level, some laws—such as U.S. naturalization requirements—standardize English, and most states have declared English as the official language. Three states and four U.S. territories have recognized local or indigenous languages in addition to English, including Hawaii (Hawaiian), Alaska (twenty Native languages), South Dakota (Sioux), American Samoa (Samoan), Puerto Rico (Spanish), Guam (Chamorro), and the Northern Mariana Islands (Carolinian and Chamorro). In Puerto Rico, Spanish is more widely spoken than English.

According to the American Community Survey, in 2010 some 229 million people (out of the total U.S. population of 308 million) spoke only English at home. More than 37 million spoke Spanish at home, making it the second most commonly used language in the United States. Other languages spoken at home by one million people or more include Chinese (2.8 million), Tagalog (1.6 million), Vietnamese (1.4 million), French (1.3 million), Korean (1.1 million), and German (1 million).

The most widely taught foreign languages in the United States, in terms of enrollment numbers from kindergarten through university undergraduate education, are Spanish (around 7.2 million students), French (1.5 million), and German (500,000). Other commonly taught languages include Latin, Japanese, American Sign Language, Italian, and Chinese.

Religion

The First Amendment of the U.S. Constitution guarantees the free exercise of religion and forbids Congress from passing laws respecting its establishment. The Latter-day Saints (commonly known as Mormons) and the Jehovah's Witnesses are the two largest religions founded in the United States, while more typical religions such as Catholicism and Protestantism were imported from other countries.

Pew Research Center studies during the late 2010s and early 2020s found that about 90% of Americans believe in God, 65% of Americans report that religion plays an important or very important role in their lives, 61% report praying weekly or more, and 43% report attending religious services at least monthly, proportions which are unique among developed countries. The United States has the world's largest Christian population. Protestantism is the largest Christian religious grouping in the United States, accounting for almost half of all Americans. Baptists collectively form the largest branch of Protestantism at 15.4%, and the Southern Baptist Convention is the largest individual Protestant denomination at 5.3% of the U.S. population. The remaining Protestants are either in other denominations, nondenominational, or not specified in the survey. In the so-called Bible Belt, located primarily within the Southern United States, socially conservative evangelical Protestantism plays a significant role culturally. By contrast, religion plays the least important role in New England and the Western United States.

In a 2014 survey, 70.6% of adults in the United States identified themselves as Christians, and 5.9% claimed a non-Christian religion. These include Judaism (1.9%), Islam (1.1%), Hinduism (0.7%), and Buddhism (0.7%). The survey also reported that 22.8% of Americans described themselves as agnostic, atheist or simply having no religion. Membership in a house of worship fell from 70% in 1999 to 47% in 2020, much of the decline related to the number of Americans expressing no religious preference. However, membership also fell among those who identified with a specific religious group.

Urbanization

About 82% of Americans live in urban areas, including suburbs; about half of those reside in cities with populations over 50,000. In 2008, 273 incorporated municipalities had populations over 100,000, nine cities had more than one million residents, and four cities (New York City, Los Angeles, Chicago, and Houston) had populations exceeding two million. Many U.S. metropolitan populations are growing rapidly, particularly in the South and West.

v t e Largest metropolitan areas in the United States 2023 MSA population estimates from the U.S. Census Bureau
	Rank	Name	Region	Pop.	Rank	Name	Region	Pop.
New York Los Angeles	1	New York	Northeast	19,498,249	11	Boston	Northeast	4,919,179	Chicago Dallas–Fort Worth
	2	Los Angeles	West	12,799,100	12	Riverside–San Bernardino	West	4,688,053
	3	Chicago	Midwest	9,262,825	13	San Francisco	West	4,566,961
	4	Dallas–Fort Worth	South	8,100,037	14	Detroit	Midwest	4,342,304
	5	Houston	South	7,510,253	15	Seattle	West	4,044,837
	6	Atlanta	South	6,307,261	16	Minneapolis–Saint Paul	Midwest	3,712,020
	7	Washington, D.C.	South	6,304,975	17	Tampa–St. Petersburg	South	3,342,963
	8	Philadelphia	Northeast	6,246,160	18	San Diego	West	3,269,973
	9	Miami	South	6,183,199	19	Denver	West	3,005,131
	10	Phoenix	West	5,070,110	20	Baltimore	South	2,834,316

Health

In a preliminary report, the Centers for Disease Control and Prevention (CDC) announced that U.S. life expectancy at birth had dropped to 76.1 years in 2021 (73.2 years for men and 79.1 years for women), down 0.9 years from 2020. This was the second year of overall decline, and the chief causes listed were the COVID-19 pandemic, accidents, drug overdoses, heart and liver disease, and suicides. Life expectancy was highest among Asians and Hispanics and lowest among Blacks and American Indian–Alaskan Native (AIAN) peoples. Starting in 1998, the average life expectancy in the U.S. fell behind that of other wealthy industrialized countries, and Americans' "health disadvantage" gap has been increasing ever since. The U.S. also has one of the highest suicide rates among high-income countries, and approximately one-third of the U.S. adult population is obese and another third is overweight.

In 2010, coronary artery disease, lung cancer, stroke, chronic obstructive pulmonary diseases, and traffic collisions caused the most years of life lost in the U.S. Low back pain, depression, musculoskeletal disorders, neck pain, and anxiety caused the most years lost to disability. The most harmful risk factors were poor diet, tobacco smoking, obesity, high blood pressure, high blood sugar, physical inactivity, and alcohol consumtion. Alzheimer's disease, substance use disorders, kidney disease, cancer, and falls caused the most additional years of life lost over their age-adjusted 1990 per-capita rates. Teenage pregnancy and abortion rates in the U.S. are substantially higher than in other Western nations, especially among blacks and Hispanics.

The U.S. health care system far outspends that of any other nation, measured both in per capita spending and as a percentage of GDP but attains worse healthcare outcomes when compared to peer nations. The U.S., however, is a global leader in medical innovation. The United States is the only developed nation without a system of universal health care, and a significant proportion of the population that does not carry health insurance.

Government-funded health care coverage for the poor (Medicaid, established in 1965) and for those age 65 and older (Medicare, begun in 1966) is available to Americans who meet the programs' income or age qualifications. In 2010, former President Obama passed the Patient Protection and Affordable Care Act or ACA, which the CDC said that the law roughly halved the uninsured share of the population and multiple studies have concluded that ACA had reduced the mortality of enrollees. However, its legacy remains controversial.

Education

American public education is operated by state and local governments and regulated by the United States Department of Education through restrictions on federal grants. In most states, children are required to attend school from the age of five or six (beginning with kindergarten or first grade) until they turn 18 (generally bringing them through twelfth grade, the end of high school); some states allow students to leave school at 16 or 17. Of Americans 25 and older, 84.6% graduated from high school, 52.6% attended some college, 27.2% earned a bachelor's degree, and 9.6% earned graduate degrees. The basic literacy rate is approximately 99%.

The United States has many private and public institutions of higher education. The majority of the world's top public and private universities, as listed by various ranking organizations, are in the United States. There are also local community colleges with generally more open admission policies, shorter academic programs, and lower tuition. The U.S. spends more on education per student than any nation in the world, spending an average of $12,794 per year on public elementary and secondary school students in the 2016–2017 school year. As for public expenditures on higher education, the U.S. spends more per student than the OECD average, and more than all nations in combined public and private spending. Despite some student loan forgiveness programs in place, student loan debt has increased by 102% in the last decade, and exceeded 1.7 trillion dollars as of 2022.

Culture and society

The United States is home to a wide variety of ethnic groups, traditions, and values, and exerts major cultural influence on a global scale. Aside from the Native American, Native Hawaiian, and Native Alaskan populations, nearly all Americans or their ancestors immigrated or were imported as slaves within the past five centuries. Mainstream American culture is a Western culture largely derived from the traditions of European immigrants with influences from many other sources, such as traditions brought by slaves from Africa. More recent immigration from Asia and especially Latin America has added to a cultural mix that has been described as a homogenizing melting pot, and a heterogeneous salad bowl, with immigrants contributing to, and often assimilating into, mainstream American culture. Nevertheless, there is a high degree of social inequality related to race and wealth.

Americans have traditionally been characterized by a strong work ethic, competitiveness, and individualism, as well as a unifying belief in an "American creed" emphasizing liberty, equality, private property, democracy, rule of law, and a preference for limited government. Americans are extremely charitable by global standards: according to a 2016 study by the Charities Aid Foundation, Americans donated 1.44% of total GDP to charity, the highest in the world by a large margin.

The American Dream, or the perception that Americans enjoy high social mobility, plays a key role in attracting immigrants. Whether this perception is accurate has been a topic of debate. While mainstream culture holds that the United States is a classless society, scholars identify significant differences between the country's social classes, affecting socialization, language, and values. Americans tend to greatly value socioeconomic achievement, but being ordinary or average is also generally seen as a positive attribute.

Holidays

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Independence Day (colloquially called the Fourth of July) is a national holiday celebrated every year on July 4 to commemorate the signing of the Declaration of Independence and the founding of the nation. George Washington's birthday is also observed as a national federal holiday, and is commonly called Presidents' Day. Christmas on December 25 is also a holiday when most government offices and business are closed.

Literature and visual arts

In the 18th and early 19th centuries, American art and literature took most of its cues from Europe, contributing to Western culture. Writers such as Washington Irving, Nathaniel Hawthorne, Edgar Allan Poe, and Henry David Thoreau established a distinctive American literary voice by the middle of the 19th century. Mark Twain and poet Walt Whitman were major figures in the century's second half; Emily Dickinson, virtually unknown during her lifetime, is recognized as an essential American poet. A work seen as capturing fundamental aspects of the national experience and character—such as Herman Melville's Moby-Dick (1851), Twain's The Adventures of Huckleberry Finn (1885), F. Scott Fitzgerald's The Great Gatsby (1925) and Harper Lee's To Kill a Mockingbird (1960)—may be dubbed the "Great American Novel." Thirteen U.S. citizens have won the Nobel Prize in Literature. William Faulkner, Ernest Hemingway and John Steinbeck are often named among the most influential writers of the 20th century. The Beat Generation writers opened up new literary approaches, as have postmodernist authors such as John Barth, Thomas Pynchon, and Don DeLillo.

In the visual arts, the Hudson River School was a mid-19th-century movement in the tradition of European naturalism. The 1913 Armory Show in New York City, an exhibition of European modernist art, shocked the public and transformed the U.S. art scene. Georgia O'Keeffe, Marsden Hartley, and others experimented with new, individualistic styles. Major artistic movements such as the abstract expressionism of Jackson Pollock and Willem de Kooning and the pop art of Andy Warhol and Roy Lichtenstein developed largely in the United States. The tide of modernism and then postmodernism has brought fame to American architects such as Frank Lloyd Wright, Philip Johnson, and Frank Gehry. Americans have long been important in the modern artistic medium of photography, with major photographers including Alfred Stieglitz, Edward Steichen, Edward Weston, and Ansel Adams.

Cinema and theater

Hollywood, a northern district of Los Angeles, California, is one of the leaders in motion picture production. The world's first commercial motion picture exhibition was given in New York City in 1894, using the Kinetoscope. Since the early 20th century, the U.S. film industry has largely been based in and around Hollywood, although in the 21st century an increasing number of films are not made there, and film companies have been subject to the forces of globalization. The Academy Awards, popularly known as the Oscars, have been held annually by the Academy of Motion Picture Arts and Sciences since 1929, and the Golden Globe Awards have been held annually since January 1944.

Director D. W. Griffith, an American filmmaker during the silent film period, was central to the development of film grammar, and producer/entrepreneur Walt Disney was a leader in both animated film and movie merchandising. Directors such as John Ford redefined the image of the American Old West, and, like others such as John Huston, broadened the possibilities of cinema with location shooting. The industry enjoyed its golden years, in what is commonly referred to as the "Golden Age of Hollywood", from the early sound period until the early 1960s, with screen actors such as John Wayne and Marilyn Monroe becoming iconic figures. In the 1970s, "New Hollywood" or the "Hollywood Renaissance" was defined by grittier films influenced by French and Italian realist pictures of the post-war period.

Theater in the United States derives from the old European theatrical tradition and has been heavily influenced by the British theater. The central hub of the American theater scene has been Manhattan, with its divisions of Broadway, Off-Broadway, and Off-Off-Broadway. Many movie and television stars have gotten their big break working in New York productions. Outside New York City, many cities have professional regional or resident theater companies that produce their own seasons, with some works being produced regionally with hopes of eventually moving to New York. The biggest-budget theatrical productions are musicals. U.S. theater also has an active community theater culture, which relies mainly on local volunteers who may not be actively pursuing a theatrical career.

Music

Among America's earliest composers was a man named William Billings who, born in Boston, composed patriotic hymns in the 1770s; Billings was a part of the First New England School, who dominated American music during its earliest stages. Anthony Heinrich was the most prominent composer before the Civil War. From the mid- to late 1800s, John Philip Sousa of the late Romantic era composed numerous military songs—particularly marches—and is regarded as one of America's greatest composers.

The rhythmic and lyrical styles of African-American music have significantly influenced American music at large, distinguishing it from European and African traditions. Elements from folk idioms such as the blues and what is known as old-time music were adopted and transformed into popular genres with global audiences. Jazz was developed by innovators such as Louis Armstrong and Duke Ellington early in the 20th century. Country music developed in the 1920s, and rhythm and blues in the 1940s.

Elvis Presley and Chuck Berry were among the pioneers of rock and roll in the mid-1950s. Rock bands such as Metallica, the Eagles, and Aerosmith are among the highest grossing in worldwide sales. In the 1960s, Bob Dylan emerged from the folk revival to become one of America's most celebrated songwriters. Mid-20th-century American pop stars such as Bing Crosby, Frank Sinatra, and Elvis Presley became global celebrities, as have artists of the late 20th century such as Michael Jackson, Madonna, Barbra Streisand, Whitney Houston, Mariah Carey, Bruce Springsteen, and Prince.

Mass media

The four major broadcasters in the U.S. are the National Broadcasting Company (NBC), Columbia Broadcasting System (CBS), American Broadcasting Company (ABC), and Fox Broadcasting Company (FOX). The four major broadcast television networks are all commercial entities. Cable television offers hundreds of channels catering to a variety of niches. As of 2021, about 83% of Americans over age 12 listen to broadcast radio, while about 41% listen to podcasts. As of September 30, 2014, there are 15,433 licensed full-power radio stations in the U.S. according to the U.S. Federal Communications Commission (FCC). Much of the public radio broadcasting is supplied by NPR, incorporated in February 1970 under the Public Broadcasting Act of 1967.

Well-known U.S. newspapers include The Wall Street Journal, The New York Times, and USA Today. More than 800 publications are produced in Spanish, the second most commonly used language in the United States behind English. With very few exceptions, all the newspapers in the U.S. are privately owned, either by large chains such as Gannett or McClatchy, which own dozens or even hundreds of newspapers; by small chains that own a handful of papers; or, in a situation that is increasingly rare, by individuals or families. Major cities often have alternative newspapers to complement the mainstream daily papers, such as New York City's The Village Voice or Los Angeles' LA Weekly. The five most popular websites used in the U.S. are Google, YouTube, Amazon, Yahoo, and Facebook.

Food

Early settlers were introduced by Native Americans to such indigenous, non-European foods as turkey, sweet potatoes, corn, squash, and maple syrup. They and later immigrants combined these with foods they had known, such as wheat flour, beef, and milk to create a distinctive American cuisine. Homegrown foods are part of a shared national menu on one of America's most popular holidays, Thanksgiving, when many Americans make or purchase traditional foods to celebrate the occasion.

The American fast food industry, the world's largest, pioneered the drive-through format in the 1940s. Characteristic American dishes such as apple pie, fried chicken, doughnuts, french fries, macaroni and cheese, ice cream, pizza, hamburgers, and hot dogs derive from the recipes of various immigrants. Mexican dishes such as burritos and tacos and pasta dishes freely adapted from Italian sources are widely consumed.

Americans drink three times as much coffee as tea. Marketing by U.S. industries is largely responsible for making orange juice and milk standard breakfast beverages.

Sports

The four most popular sports in the U.S. are American football, basketball, baseball and ice hockey.

While most major U.S. sports such as baseball and American football have evolved out of European practices, basketball, volleyball, skateboarding, and snowboarding are American inventions, some of which have become popular worldwide. Lacrosse and surfing arose from Native American and Native Hawaiian activities that predate Western contact. The market for professional sports in the United States is roughly $69 billion, roughly 50% larger than that of all of Europe, the Middle East, and Africa combined.

American football is by several measures the most popular spectator sport in the United States; the National Football League (NFL) has the highest average attendance of any sports league in the world, and the Super Bowl is watched by tens of millions globally. Baseball has been regarded as the U.S. national sport since the late 19th century, with Major League Baseball being the top league. Basketball and ice hockey are the country's next two most popular professional team sports, with the top leagues being the National Basketball Association and the National Hockey League. The most-watched individual sports in the U.S. are golf and auto racing, particularly NASCAR and IndyCar.

Eight Olympic Games have taken place in the United States. The 1904 Summer Olympics in St. Louis, Missouri, were the first-ever Olympic Games held outside of Europe. The Olympic Games will be held in the US for a ninth time when Los Angeles hosts the 2028 Summer Olympics. As of 2021, the United States has won 2,629 medals at the Summer Olympic Games, more than any other country, and 330 in the Winter Olympic Games, the second most behind Norway. In soccer, the men's national soccer team qualified for eleven World Cups and the women's team has won the FIFA Women's World Cup four times. The United States hosted the 1994 FIFA World Cup and will co-host the 2026 Cup with Canada and Mexico. On the collegiate level, college football and basketball attract large audiences, as the NCAA Final Four is one of the most watched sporting events.

See also

• Index of United States–related articles
• Lists of U.S. state topics
• Outline of the United States

Notes

1. English is the official language of 32 states; English and Hawaiian are both official languages in Hawaii, and English and 20 indigenous languages are official in Alaska. Algonquian, Cherokee, and Sioux are among many other official languages in Native-controlled lands throughout the country. French is a de facto but unofficial language in Maine and Louisiana, while New Mexico law grants Spanish a special status. In five territories, English as well as one or more indigenous languages are official: Spanish in Puerto Rico, Samoan in American Samoa, and Chamorro in both Guam and the Northern Mariana Islands. Carolinian is also an official language in the Northern Mariana Islands.
2. The historical and informal demonym Yankee has been applied to Americans, New Englanders, or northeasterners since the 18th century.
3. ^ The United States is the third-largest country by total area, after Russia and Canada, if its coastal and territorial water areas are included. If only its internal waters are included (bays, sounds, rivers, lakes, and the Great Lakes), the U.S. is the fourth-largest, after Russia, Canada, and China.
   
   Coastal/territorial waters included: 3,796,742 sq mi (9,833,517 km)
   Only internal waters included: 3,696,100 sq mi (9,572,900 km)
4. ^ The U.S. Census Bureau provides a continuously updated but unofficial population clock in addition to its decennial census and annual population estimates:
5. Excludes Puerto Rico and the other unincorporated islands because they are counted separately in U.S. census statistics.
6. See Time in the United States for details about laws governing time zones in the United States.
7. A single jurisdiction, the U.S. Virgin Islands, uses left-hand traffic.
8. The five major territories are American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the United States Virgin Islands. There are eleven smaller island areas without permanent populations: Baker Island, Howland Island, Jarvis Island, Johnston Atoll, Kingman Reef, Midway Atoll, and Palmyra Atoll. U.S. sovereignty over Bajo Nuevo Bank, Navassa Island, Serranilla Bank, and Wake Island is disputed.
9. The United States has a maritime border with the United Kingdom because the U.S. Virgin Islands borders the British Virgin Islands. Puerto Rico has a maritime border with the Dominican Republic. American Samoa has a maritime border with the Cook Islands (see Cook Islands–United States Maritime Boundary Treaty). American Samoa also has maritime borders with independent Samoa and Niue.
10. New Hampshire, Massachusetts, Connecticut, Rhode Island, New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina, and Georgia
11. John Adams, Thomas Jefferson, Benjamin Franklin, Roger Sherman, and Robert R. Livingston
12. updated as of September 8, 2022
13. In the unusual event of a tie in the Senate, the U.S. Constitution authorizes the Vice President (currently Kamala Harris) to cast a tie-breaking vote, however, the House Speaker retains general day-to-day leadership over the legislative branch.
14. People born in American Samoa are non-citizen U.S. nationals, unless one of their parents is a U.S. citizen. In 2019, a court ruled that American Samoans are U.S. citizens, but the litigation is onging.
15. This figure, like most official data for the United States as a whole, excludes the five unincorporated territories (Puerto Rico, Guam, the U.S. Virgin Islands, American Samoa, and the Northern Mariana Islands) and minor island possessions.
16. Inupiaq, Siberian Yupik, Central Alaskan Yup'ik, Alutiiq, Unanga (Aleut), Denaʼina, Deg Xinag, Holikachuk, Koyukon, Upper Kuskokwim, Gwichʼin, Tanana, Upper Tanana, Tanacross, Hän, Ahtna, Eyak, Tlingit, Haida, and Tsimshian.
17. Also known less formally as Obamacare

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Further reading

• Acharya, Viral V.; Cooley, Thomas F.; Richardson, Matthew P.; Walter, Ingo (2010). Regulating Wall Street: The Dodd-Frank Act and the New Architecture of Global Finance. Wiley. p. 592. ISBN 978-0-470-76877-8.
• Baptist, Edward E. (2014). The Half Has Never Been Told: Slavery and the Making of American Capitalism. Basic Books. ISBN 978-0-465-00296-2.
• Barth, James; Jahera, John (2010). "US Enacts Sweeping Financial Reform Legislation". Journal of Financial Economic Policy. 2 (3): 192–195. doi:10.1108/17576381011085412.
• Berkin, Carol; Miller, Christopher L.; Cherny, Robert W.; Gormly, James L. (2007). Making America: A History of the United States, Volume I: To 1877. Cengage Learning. p. 75. ISBN 978-0-618-99485-4.
• Bianchine, Peter J.; Russo, Thomas A. (1992). "The Role of Epidemic Infectious Diseases in the Discovery of America". Allergy and Asthma Proceedings. 13 (5): 225–232. doi:10.2500/108854192778817040. PMID 1483570.
• Blakeley, Ruth (2009). State Terrorism and Neoliberalism: The North in the South. Routledge. ISBN 978-0-415-68617-4.
• Boyer, Paul S.; Clark Jr., Clifford E.; Kett, Joseph F.; Salisbury, Neal; Sitkoff, Harvard; Woloch, Nancy (2007). The Enduring Vision: A History of the American People. Cengage Learning. p. 588. ISBN 978-0-618-80161-9.
• Brokenshire, Brad (1993). Washington State Place Names. Caxton Press. p. 49. ISBN 978-0-87004-562-2.
• Calloway, Colin G. (1998). New Worlds for All: Indians, Europeans, and the Remaking of Early America. JHU Press. p. 229. ISBN 978-0-8018-5959-5.
• Cobarrubias, Juan (1983). Progress in Language Planning: International Perspectives. Walter de Gruyter. ISBN 978-90-279-3358-4.
• Cowper, Marcus (2011). National Geographic History Book: An Interactive Journey. National Geographic Society. ISBN 978-1-4262-0679-5.
• Davis, Kenneth C. (1996). Don't know much about the Civil War. New York: William Marrow and Co. p. 518. ISBN 978-0-688-11814-3.
• Daynes, Byron W.; Sussman, Glen (2010). White House Politics and the Environment: Franklin D. Roosevelt to George W. Bush. Texas A&M University Press. p. 320. ISBN 978-1-60344-254-1. OCLC 670419432. Presidential environmental policies, 1933–2009
• Erlandson, Jon M; Rick, Torben C; Vellanoweth, Rene L (2008). A Canyon Through Time: Archaeology, History, and Ecology of the Tecolote Canyon Area, Santa Barbara County. California: University of Utah Press. ISBN 978-0-87480-879-7.
• Fagan, Brian M. (2016). Ancient Lives: An Introduction to Archaeology and Prehistory. Routledge. ISBN 978-1-317-35027-9.
• Feldstein, Sylvan G.; Fabozzi, Frank J. (2011). The Handbook of Municipal Bonds. John Wiley & Sons. p. 1376. ISBN 978-1-118-04494-0.
• Ferguson, Thomas; Rogers, Joel (1986). "The Myth of America's Turn to the Right". The Atlantic. 257 (5): 43–53. Retrieved March 11, 2013.
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• Gelo, Daniel J. (2018). Indians of the Great Plains. Taylor & Francis. ISBN 978-1-351-71812-7.
• García, Ofelia (2011). Bilingual Education in the 21st Century: A Global Perspective. John Wiley & Sons. ISBN 978-1-4443-5978-7.
• Gold, Susan Dudley (2006). United States V. Amistad: Slave Ship Mutiny. Marshall Cavendish. p. 144. ISBN 978-0-7614-2143-6.
• Gordon, John Steele (2004). An Empire of Wealth: The Epic History of American Economic Power. HarperCollins. ISBN 978-0-06-009362-4.
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• Martone, Eric (2016). Italian Americans: The History and Culture of a People. ABC-CLIO. ISBN 978-1-61069-995-2.
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• Levenstein, Harvey (2003). Revolution at the Table: The Transformation of the American Diet. Berkeley and Los Angeles: University of California Press. ISBN 978-0-520-23439-0.
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• Meltzer, David J. (2009). First Peoples in a New World: Colonizing Ice Age America. University of California Press. ISBN 978-0-520-94315-5.
• The New York Times (2007). The New York Times Guide to Essential Knowledge: A Desk Reference for the Curious Mind (2nd ed.). St. Martin's Press. ISBN 978-0-312-37659-8.
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External links

• Resources in your library
• Resources in other libraries

• United States. The World Factbook. Central Intelligence Agency.
• United States, from the BBC News
• Key Development Forecasts for the United States from International Futures

Government

• Official U.S. Government Web Portal Gateway to government sites
• House Official site of the United States House of Representatives
• Senate Official site of the United States Senate
• White House Official site of the president of the United States
• Supreme Court Official site of the Supreme Court of the United States

History

• Historical Documents Collected by the National Center for Public Policy Research
• U.S. National Mottos: History and Constitutionality Analysis by the Ontario Consultants on Religious Tolerance
• USA Collected links to historical data

Maps

• National Atlas of the United States Official maps from the U.S. Department of the Interior
• Wikimedia Atlas of the United States
• Geographic data related to United States at OpenStreetMap
• Measure of America A variety of mapped information relating to health, education, income, and demographics for the U.S.

Photos

• Photos of the USA

• United States
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• United States
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