1979 Rhodesian constitutional referendum
A constitutional referendum was held in Rhodesia on 30 January 1979. It followed the Internal Settlement drawn up between Prime Minister Ian Smith and Abel Muzorewa, leader of the non-violent UANC. The new constitution would bring in black majority rule in the country, which would be renamed Zimbabwe Rhodesia.
Source: Wikipedia — 1979 Rhodesian constitutional referendum (CC BY-SA 4.0)