Answer: British Empire
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Following the defeat of the Boers in the Anglo–Boer or South African War (1899–1902), the Union of South Africa was created as a self-governing dominion of the British Empire on 31 May 1910 in terms of the South Africa Act 1909, which amalgamated the four previously separate British colonies: Cape Colony, Colony of Natal, Transvaal Colony, and Orange River Colony.
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