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The banovinas of Yugoslavia, established in 1929, deliberately avoided following ethnic or religious boundaries which resulted in the country's ], like other ethnic groups, being divided among several banovinas. Following a struggle within the ] Kingdom of Yugoslavia, Croat leaders won ] for a new ethnic-based banovina with the ]. In 1939, the entire area of the ] and ]s was combined and parts of the ], ], ] and ] banovinas were added to form the Banovina of Croatia.
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In 1941, the ] ] occupied the Banovina of Croatia and the province was abolished. Some of the coastal areas from ] to ] and near the ] were annexed by ] but the remainder became a part of the ]. Following World War II, the region was divided between new states of ], ] and ] (autonomous ] province) within a ] ].
Banovina of Croatia was populated mostly by Croats (74%), but it also had large Serb minority (19%). It was divided on 99 kotars of which 81 had Croat majority, 17 Serbian (12 absolute, 5 relative) and 1 which muslim majority which were not considered separate nation at the time.