What is the capital of the United States?

Washington D.C. is the capital of the United States because it was specifically established as the nation's capital in the late 18th century, following the American Revolution. The location was chosen to serve as a neutral ground between the northern and southern states and to symbolize the federal government. The city was designed to be the center of government, housing key institutions such as the White House, the U.S. Capitol, and the Supreme Court. Additionally, Washington D.C. plays a crucial role in the political and administrative functions of the country, making it pivotal for governance and diplomacy.

Other cities mentioned, such as New York City, Los Angeles, and Chicago, are major urban centers in the United States but do not serve as the capital, which is a designated status that Washington D.C. uniquely holds.