<P> The Union of South Africa ( Dutch : Unie van Zuid - Afrika , Afrikaans : Unie van Suid - Afrika pronunciation ( help info ) ) is the historic predecessor to the present - day Republic of South Africa . It came into being on 31 May 1910 with the unification of four previously separate British colonies : the Cape , Natal , Transvaal and Orange River colonies . It included the territories formerly part of the Boer republics annexed in 1902 , the South African Republic and the Orange Free State . </P>
<P> The Union of South Africa ( Dutch : Unie van Zuid - Afrika , Afrikaans : Unie van Suid - Afrika pronunciation ( help info ) ) is the historic predecessor to the present - day Republic of South Africa . It came into being on 31 May 1910 with the unification of four previously separate British colonies : the Cape , Natal , Transvaal and Orange River colonies . It included the territories formerly part of the Boer republics annexed in 1902 , the South African Republic and the Orange Free State . </P>
four colonies that were joined to form the union of south africa
four colonies that were joined to form the union of south africa
Cape Natal Transvaal Orange River
Cape Natal Transvaal Orange River