AHC: Make South Africa a first world Economy

What changes would be required to make South Africa a Country with living standards comparable to a developed nation like the US or Singapore.
 
This is pre-1900 but doable: US does 1924-type quotas in say 1832. South Africa might be no Brazil/Argentina/Canada who get most of the immigrants but it gets quite a few, especially anglos. You end up with a big South Africa covering OTL's SA, namibia, zimbabwe, botswana, lesotho, swaziland. It's around half white, has an averaged out standard of living comparable to OTL Italy -- whites/coloreds live like people in advanced bits of the first world while blacks live at roughtly OTL Puerto Rican standards of living. Outvoted afrikaners mean Rhodesia-type qualified franchise is the norm until the 1970s when blacks get the vote.
 
avoid apartheid, avoid immediate integration. UP policy of a race federation, evolves into greater Indian white immigration.
Avoid Afrikaner protectionism, low taxes. embrace colored mixed race in 1920, Xhosa zulu around 1960.
 
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