What is the capital of the United States?

The capital of the United States is Washington, D.C. This choice is correct because Washington, D.C., was established as the nation's capital in 1790, primarily to serve as a neutral ground between the northern and southern states. It was strategically chosen for its location along the Potomac River, allowing for access to both Maryland and Virginia, which were critical states in early U.S. history. Washington, D.C. is the seat of the federal government, housing important institutions such as the White House, the U.S. Capitol, and the Supreme Court.

The significance of Washington, D.C. as the capital also lies in its role as a center for political activity, legislation, and diplomacy. It is a symbol of national governance and is recognized internationally. This historical and political context reinforces why it is the correct answer. Other cities, such as Los Angeles, New York City, and Chicago, are major urban centers in the U.S. with historical importance and cultural significance, but they do not serve as the capital of the country.