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[[File:Britain and Ireland satellite image bright.png|thumb|Satellite photograph of Great Britain and Ireland. British nationalism typically focuses on the unity of the British Isles.
British nationalism asserts that the British people are a nation and promotes their cultural unity, in a definition of Britishness that may include people of English, Scottish, Welsh, and Irish descent (those living in both Northern Ireland and Great Britain and historically the whole of Ireland when it was within the United Kingdom). British nationalism is closely associated with British unionism, which seeks to uphold the political union that is the United Kingdom, or strengthen the links between the countries of the United Kingdom.
British nationalism's unifying identity descends from the ancient Britons who dwelt on the island of Great Britain. British nationalism grew to include people outside Great Britain, in Ireland, because of the 1542 Crown of Ireland Act, which declared that the crown of Ireland was to be held by the ruling monarch of England as well as Anglo-Irish calls for unity with Britain.
It is characterised as a "powerful but ambivalent force in British politics". In its moderate form, British nationalism has been a civic nationalism, emphasizing both cohesion and diversity of the people of the United Kingdom, its dependencies, and its former colonies. However, nativist nationalism has arisen based on fear of Britain being swamped by immigrants; this anti-immigrant nativist nationalism has manifested politically in the British National Party and other nativist nationalist movements. Politicians, such as former British prime ministerDavid Cameron, have sought to promote British nationalism as a progressive cause.
^ Guntram H. Herb, David H. Kaplan. Nations and Nationalism: A Global Historical Overview: A Global Historical Overview. Santa Barbara, California, USA: ABC-CLIO, 2008.
Miller, William Lockley (2005), "Anglo-Scottish Relations from 1900 to Devolution and Beyond", Proceedings of the British Academy, 128, Oxford University Press, ISBN978-0-19-726331-0
Note: Forms of nationalism based primarily on ethnic groups are listed above. This does not imply that all nationalists with a given ethnicity subscribe to that form of ethnic nationalism.