The United States of America, commonly known as the U.S.A., is a country located in North America. It consists of 50 states, a federal district, and several territories. The capital city is Washington, D.C., while New York City is the largest city. The U.S.A. is known for its diverse culture, geography, and economy, making it one of the most influential countries in the world. The country was founded in 1776 with the signing of the Declaration of Independence. The U.S.A. operates under a federal government system, with three branches: the executive, legislative, and judicial. It is a member of various international organizations, including the United Nations and NATO.