South Africa. If there was no Nelson Mandela and events in Zimbabwe followed OTL course but faster, the Whites might try and cling on to power out of desperation. Economic sanctions and ever decreasing living standards aren't going to get you to negotiate a way out if you believe the only alternative you got to hanging on to the status quo is getting killed. Now in that scenario a Civil War is the most likely outcome. But another one would be adopting ever more repressive measures to avoid one, getting stricter sanctions because of it and devolving into Nazi-North-Korea basically.