A referendum on becoming an Overseas territory was held in Wallis and Futuna on 27 December 1959. The proposal was approved by 94.37% of voters. Every voter on Wallis voted in favour, whilst all but three of the votes against the proposal were cast in the Futuna Islands.
Results
Do you want the Wallis and Futuna Isles to become an integral part of the French Republic as an Overseas territory?
References
Wallis and Futuna status referendum, 1959 Wikipedia(Text) CC BY-SA