Washington, D.C. is the capital city of the United States of America. "D.C." is an abbreviation for the District of Columbia, the federal district coextensive with the city of Washington. The city is named after George Washington, military leader of the American Revolution and the first President of the United States. The city is commonly referred to as D.C., the District, or simply Washington. The centers of all three branches of the U.S. federal government are in the District. It also serves as the headquarters for the World Bank, the International Monetary Fund, the Organization of American States, the Inter-American Development Bank, and other national and international institutions. Washington is the frequent location of large political demonstrations and protests, particularly on the National Mall. Furthermore, Washington is the site of numerous national landmarks, monuments and museums, and it is a popular destination for tourists.