Chuuk Constitution Day is observed in Chuuk, one of the states of Micronesia, every October 1. This holiday commemorates the adoption of the Chuuk State Constitution, which came into force on October 1, 1989, marking it as the last state constitution adopted after Micronesia's transition to independence. The Chuuk State Constitution includes various articles addressing territory, rights, governance, and public services, and has been amended several times, with the most recent amendment occurring in 2004. Chuuk is the most populous state in Micronesia, consisting of several islands in the Chuuk Lagoon, and its traditional way of life has been maintained despite historical colonization by Spain, Germany, and Japan. Chuuk Constitution Day is one of four state constitution days celebrated in Micronesia, alongside Kosrae, Pohnpei, and Yap Constitution Days, with the adoption of the federal constitution also celebrated on May 10.