What is the capital of the United States?

The capital of the United States is Washington, D.C., which was established as the nation's capital in 1790. It was specifically chosen for its central location along the Potomac River, between the Northern and Southern states, in an effort to promote unity. The city was designed to be the seat of the federal government, housing important institutions like the White House, the Capitol, and the Supreme Court. This unique status as a federal district, distinct from any state, allows for direct oversight by Congress, emphasizing its importance as the political heart of the nation. The other cities listed do not serve as the capital and do not hold the same significance in terms of government and political operations.