"Come on, there were vast areas of uninhabited land in Southern Africa just as there were uninhabited areas in the Americas and Australasia."
Exactly, and if you knew how Bantu clans are dispersed within South Africa you would know this:
Venda, Shona, Shangaan/Tsonga clans settled on the upper North of Southern Africa, this means they settled within parts of modern Northern South Africa and parts of Zimbabwe, Zambia, Mozambique, Botswana etc.
Tswana, S. Sotho and N. Sotho clans settled into whats the North West and Western part of Southern Africa, as well as Western Drakensberg areas (LeSOTHO).
Zulu, Xhosa, Ndebele, Swati etc clans settled into whats the Eastern coast of Southern Africa, which is From Mozambique, all the way to what's Eastern Cape today.
Khoi & San clans setteled prior to Bantu (above mentioned clans) in areas I mentioned earlier.
All these clans have sub clans and this land they settled on became theirs (assuming at the time it was uninhabited) and was taken from them, regardless of how you want to technically define it in todays social definitions.
The biggest issue "blacks" have with apartheid is not being conquered, that happened. Zulu's wanted to conquer some Sotho clans, etc. It's how it systematically destroyed natives in South Africa, and it's roots were established by prior settlers (I love history so even I know white settlers loved themselves some Sara Baartman-esque nookie while away from the wives, so race wasn't such a train smash), and how those roots remain till today. Once the Brits and Dutch settlers started discovering minerals in said prior settled lands, how they made sure they created laws to take land to benefit only a specific race (South Africa Act of 1910, the Native Land Act of 1913, Natives in Urban Areas Bill of 1918, Urban Areas Act of 1923, the Colours Bar Act of 1926, Asiatic Registration Act of 1906 and so on... you'll read those in your own time).
Funny enough the only clan to outsmart one of these acts, the Ba***eng ba bakwena (The Royal Ba***eng as you know them) are the only South African natives to still hold some financial power in their own areas (Rustenburg, Phokeng and surrounding areas), and have prospered immensely, and it's widely recorded they lived on that land hundreds of years before these acts that diluted native power come into effect. So whilst you might want to justify "unoccupied land" and "it wasn't those blacks to begin with" or other technical mumbo jumbo just because it wasn't written on some piece of paper, visit the Ba***eng and read on how they were able to keep their land, and are one, if not, the richest bantu clan in South Africa today! This same benefit which was stripped from other clans, especially the Khoi-San. You don't see a Khoi name at the De Beers headquarters. That is why I posed questions that asked people about if they actually have gone out of their way to REALLY LEARN about natives in South Africa and stop painting blacks as blacks when they consist of so much more!
Read King Leopold's Ghost if you think the issue is about South African blacks have with South African White's only. Once a minority starts flexing their muscles to the majority, and still do so with the feeling that this is a perfectly setup scenario, that is when I get highly pissed off with comments that claim "blacks" stole land prior to it being conquered by whites, and blacks should just shutup cos the country is now rainbow and happier.