A referendum was held in France on 20 and 21 December 1851. Voters were asked whether they approved of the continuation of the authority of Louis Napoléon Bonaparte and to delegate the powers required to produce a new constitution. It was approved by 92% of voters with an 81.7% turnout.
Results
92.03% of French voters voted in favor of the amendment, while 18.35% of electors abstained from voting.
References
French constitutional referendum, 1851 Wikipedia(Text) CC BY-SA