may 31, 1910 - The Union of South Africa combined the colonies of Cape and Natal, and republics of the Orange Free state and the Transvaal.
Description:
Both former republics were incorporated into the Union of South Africa in 1910, which Boers controlled. the Union of South Africa was granted the administration of South West Africa as a League of Nations mandate, which became treated in most respects as if it were another province of the Union, but never was formally annexed.
Added to timeline:
Africa's imperialism timeline
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