Mongolian independence referendum, 1945
An independence referendum was held in the Mongolian People's Republic on 20 October 1945. It was approved by 100% of voters, with no votes against. Voter turnout was 98.5%.
...
Wikipedia
An independence referendum was held in the Mongolian People's Republic on 20 October 1945. It was approved by 100% of voters, with no votes against. Voter turnout was 98.5%.