Nigeria (British colony)
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Colonial Nigeria formed part of the British Empire from the mid-nineteenth century until 1 October 1960, when Nigeria achieved independence. Britain annexed Lagos in 1861 and established the Oil River Protectorate in 1884. British influence in the Niger area increased gradually in the course of the 19th century, but Britain did not effectively occupy the area until 1885. Other European powers acknowledged Britain's dominance over the area at the 1885 Berlin Conference.
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