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I wanted to imagine how these countries might have survived into the present day.
My POD's would be
Slightly earlier settlement of Angola and Mozambique, so that they have a slightly larger white population. I saw another thread imagining something like this called Angola Avante .
Portugal becomes democratic at some point and ITTL Angola and the southern part of Mozambique both do a Rhodesia and become independent. They both receive support from South Africa/Rhodesia.
United Party wins in 1948 and because of this South Africa has a more liberal form of segregation like Rhodesia. No apartheid means the British allow Namibia/Botswana/Lesotho/Swaziland to join SA.
In 1922 Northern Rhodesia votes to join Southern Rhodesia.
At some point SA becomes a republic.
At some point they form some kind of economic community like the EEC.
At some point they form some kind of military alliance like Nato.
SA still develops nukes.
Late 80s/Early 90s these four nations start coming under more severe sanctions, however they aren't too severe because of these four countries huge natural reserves.
They ride out the 90s and the commodities boom of the 2000s helps strengthen their position.
During the same period of the last bullet point they develop stronger ties with China because of China's need for raw materials. They also encourage white migrants from the ex-USSR which helps them develop closer ties with Russia.