one million during the workweek. The Washington metropolitan area, which includes parts of Maryland, Virginia, and West Virginia, is the country's sixth-largest metropolitan area with a 2020 population of 6.3 million residents; and over 54 million people live within of the city. The city is the home to each of the three branches of the U.S. federal government, Congress (legislative), the President (executive), and the Supreme Court (judicial), along with the governmental buildings that house most of the federal government, including the White House, the Capitol, the Supreme Court Building, and multiple federal departments and agencies. The city is home to many national monuments and museums, primarily located on or around the National Mall, including the Jefferson Memorial, the Lincoln Memorial, and the Washington Monument. The city hosts 177 foreign embassies and the headquarters of the World Bank, the International Monetary Fund, the Organization of American States, and other international organizations. Many of the nation's largest industry associations, non-profit organizations, and think tanks are based in the city, including AARP, the American Red Cross, Atlantic Council, Brookings Institution, National Geographic Society, The Heritage Foundation, Wilson Center, and others. A locally elected mayor and 13-member council have governed the district since 1973. Congress maintains supreme authority over the city, however, and is empowered to overturn local laws. Washington, D.C. residents are, on a federal level, politically disenfranchised since the city's residents do not have voting representation in Congress, although the city's residents elect a single at-large congressional delegate to the U.S. House of Representatives who has no vote. District voters choose three presidential electors in accordance with the Twenty-third Amendment, ratified in 1961. Washington, D.C. has been a member state of the Unrepresented Nations and Peoples Organization since 2015. History Various tribes of the Algonquian-speaking Piscataway people, also known as the Conoy, inhabited the lands around the Potomac River when Europeans arrived and colonized the reguion in the early 17th century. One group known as the Nacotchtank, also called the Nacostines by Catholic missionaries, maintained settlements around the Anacostia River in present-day Washington, D.C. Conflicts with European colonists and neighboring tribes forced the Piscataway people to relocate, some of whom established a new settlement in 1699 near Point of Rocks, Maryland. Foundation Prior to the establishment of Washington, D.C. as the nation's capital in 1800, the Second Continental Congress was based in Philadelphia on five separate occasions (May 1775-July 1776, December