So Mandela was referring to the political pressure the ANC put on the old NP government along with their terrorist acts. Blowing up churches, bombing cars etc. If you think the NP just decided to give up to a democracy you're dreaming. It was a negotiated transition as a consequence of international pressure, as well as terrorist behaviour that the ANC conducted. Perhaps you should find out why Mandela was jailed. It wasn't because he was a peaceful loving and all round nice guy who was in the wrong place at the wrong time.What was done to the apartheid government? The NP got defeated in a free and fair election and they died a natural death after that, you are free to mobilize and do the same to the ANC, no need to wait for some referendum.