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. serves as the political and administrative center of the federal government. Established as the capital through the Residence Act of 1790, it was specifically chosen for its location along the Potomac River, which was seen as a compromise between the Northern and Southern states.

In Washington, D.C., you'll find important government buildings such as the White House, where the President resides; the Capitol, where Congress meets; and the Supreme Court, the highest judicial authority in the country. As the capital, it embodies the nation's democratic ideals and is a focal point for national events and ceremonies.

The other options, while significant cities, are not the capital of the United States. New York City and Chicago are both major urban centers with rich histories and cultural importance, whereas Los Angeles is known for its entertainment industry. However, none of them serve as the seat of the federal government, which is the defining characteristic of a capital city.