The U.S., or the United States of America, is a country located primarily in North America. It consists of 50 states, a federal district, and several territories. The capital city is Washington, D.C., and the largest city is New York City. The U.S. has a diverse population and is known for its cultural, economic, and political influence worldwide. The country operates under a federal government system, with powers divided between the national and state governments. The U.S. Constitution, adopted in 1787, serves as the supreme law of the land. The economy is one of the largest in the world, driven by various industries, including technology, finance, and agriculture.