What is the capital of the United States?

Washington D.C. serves as the capital of the United States, and it is the seat of the federal government. Established as the capital under the Residence Act of 1790, this city was chosen due to its strategic location along the Potomac River, balancing the interests of both northern and southern states. Washington D.C. houses the three branches of the U.S. government: the legislative branch in the Capitol Building, the executive branch in the White House, and the judicial branch in the Supreme Court. This centralization of political power and government functions distinguishes Washington D.C. as not just a symbolic capital but also a functioning hub for national decision-making and policy development.

The other choices reflect major cities in the United States, but they do not fulfill the role of the nation's capital. New York City, while historically significant and the first capital of the United States under the Articles of Confederation, is no longer the seat of government. Los Angeles is known for its entertainment industry and cultural influence, and Chicago, though a major city in the Midwest with historical significance, also does not function as the capital. Thus, Washington D.C. is unequivocally recognized as the capital of the United States.