> Officially, the black areas of South Africa during apartheid were different countries too.
Well, no. Some black areas in South Africa (and South West Africa under South Africa's occupation) were converted into notionally internally self-governing regions, but of the twenty (10 each in South and South West Africa), only 10 (4 in South Africa, 6 in South West Africa) were ever even nominally (that is, according to the South African government -- no other government recognized any of them) independent states, and, in any case, there were a lot of black areas in South (and South West) Africa that were not part of either these "homelands", whether the notionally independent ones are otherwise.
(Now, in 1970, all of the black people of South Africa, whether they lived in the "homelands" or not, were assigned citizenship in one of them and had their South African citizenship cancelled. But that doesn't mean that the "homelands" covered all the black areas.)
Well, no. Some black areas in South Africa (and South West Africa under South Africa's occupation) were converted into notionally internally self-governing regions, but of the twenty (10 each in South and South West Africa), only 10 (4 in South Africa, 6 in South West Africa) were ever even nominally (that is, according to the South African government -- no other government recognized any of them) independent states, and, in any case, there were a lot of black areas in South (and South West) Africa that were not part of either these "homelands", whether the notionally independent ones are otherwise.
(Now, in 1970, all of the black people of South Africa, whether they lived in the "homelands" or not, were assigned citizenship in one of them and had their South African citizenship cancelled. But that doesn't mean that the "homelands" covered all the black areas.)