Original: Independence After four years of negotiating, the Union of South Africa was created from the Cape and Natal colonies, as well as the republics of Orange Free State and Transvaal, on 31 May 1910, exactly eight years after the end of the Second Boer War.
Simplified: On May 31, 1910 the Union of South Africa was created from the Cape and Natal colonies, as well as the Orange Free State and the Transvaal, the two Boer Republics.