National Day in Iraq is observed every October 3, celebrating the anniversary of Iraq's declaration of independence from Great Britain in 1932. The territory of present-day Iraq was part of the Ottoman Empire until its defeat in World War I, after which it became a League of Nations mandate administered by Britain. In 1921, the Kingdom of Iraq was established under British administration with Faisal I as its king. The signing of the Anglo-Iraqi Treaty marked a significant development in Iraqi politics, leading to a rise in nationalist movements. On October 3, 1932, Iraq gained independence and became a member of the League of Nations, a date now commemorated as National Day, also referred to as Independence Day. This public holiday is marked by various celebrations throughout the country.