What if, in circa 1975-76, just after the independance of Angola and Mozambique from Portugal, South Africa decided to enter in Rhodesia in order to help Rhodesian Army in their struggle against Zanu and Zipra ?
First at all, is it a plausible POD ? Would white afrikaner, whom ancesters fought british in a total war at the beginning of the century, have been willing to support white Rhodesian and their british way of life ?
Besides this, a full fledged engagement of SADF in Rhodesia wouldn't have led to a dramatic increase of UN, American, British and Soviet pressure that would have hitten more and more severely SA's economy ?