Constitution Day is observed in Palau every July 9 as a public holiday, celebrating the adoption of the nation's constitution in 1981. This significant document marked Palau's decision to decline participation in the formation of the Federated States of Micronesia and established Palau as the first country in the world with a nuclear-free constitution, banning all activities related to nuclear, toxic chemical, gas, and biological weapons. Festive activities primarily take place in Koror and the capital city, Ngerulmud, where islanders enjoy a day off to commemorate this important milestone in their political history. The United States provides defense, funding, and access to social services to Palau, reflecting their political association.