Excerpts from Books and Wikipedia
"Within the country, anti-British policies among white South Africans focused on independence. During the Dutch and British colonial years, racial segregation was mostly informal, though some legislation was enacted to control the settlement and movement of native people, including the Native Location Act of 1879 and the system of pass laws. Eight years after the end of the Second Boer War and after four years of negotiation, an act of the British Parliament (South Africa Act 1909) granted nominal independence, while creating the Union of South Africa on 31 May 1910. The Union was a dominion that included the former territories of the Cape, Transvaal and Natal colonies, as well as the Orange Free State republic. The Natives' Land Act of 1913 severely restricted the ownership of land by blacks; at that stage natives controlled only seven percent of the country. The amount of land reserved for indigenous peoples was later marginally increased. In 1931, the union was fully sovereign from the United Kingdom with the passage of the Statute of Westminster, which abolished the last powers of the British Government on the country." [Wikipedia]