Act of Self Determination Day is observed in the Cocos (Keeling) Islands every April 6. This public holiday commemorates the referendum held on April 6, 1984, when the islanders voted on their future status, resulting in a majority supporting integration with Australia. The Cocos Islands, discovered in 1609 and annexed by the British Empire in 1857, were transferred to Australian control in 1955 due to dissatisfaction with the local feudal governance by the Clunies-Ross family. The referendum included participation from all 261 eligible islanders, with 229 voting for integration, while others opted for free association or independence. The day serves as a reminder of the islands' journey towards self-determination and their current status as an external territory of Australia.