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The slave trade was joined by Great Britain and France
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Great Britain and the Untited States Of America abolished slavery
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By war the British conquered Benin in 1897,
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Nigeria was officially colonized on January 1, 1901 when it became a British protectorate, and part of the British Empire.
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and in the Anglo-Aro War from 1901—1902 defeated other opponents. The restraint or complete destruction of these states opened up the Niger area to British rule.
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In 1914, the British formally united the Niger area as the Colony and Protectorate of Nigeria. Administratively, Nigeria remained divided into the northern and southern provinces and Lagos Colony.
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Northern Nigeria did not outlaw slavery until 1936.
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Nigeria became independent in 1960.