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Black South Africans are descendants of immigrants from further north in Africa who first entered what are now the confines of the country roughly one thousand years ago. White South Africans are descendants of later European settlers, mainly from the Netherlands and Britain, thats why they speak english in South Afruca. Since the establishing of the Union of South Africa in 1910, South Africa had four provinces consisting of the divisions which existed prior to the Second Boer War: two British colonies (the Cape Colony and Natal Colony) and two Boer republics (the Orange Free State and Transvaal Republic). Segregation of the black population started as early as 1913, with ownership of land by the black majority being restricted to certain areas totaling about 13% of the country.

Sources: Wikipedia.  http://en.wikipedia.org/wiki/Provinces_of_South_Africa