A constitutional referendum was held in Haiti on 22 July 1985. The amendments to the new constitution would restore multi-party politics, although only on the condition that all parties swore allegiance to President Jean-Claude Duvalier, as well as re-confirming Duvalier as President for Life and allowing him to single-handedly appoint the Prime Minister and his successor. The changes were reportedly approved by 99.98% of voters, although it was widely considered a sham and led to Duvalier being overthrown the following year.
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Text from the Wikipedia article “Haitian constitutional referendum, 1985”, available under CC BY-SA 4.0.