The Full form of USA is The United States of America. The USA, commonly known as America or the United States (US), is a country consisting of 50 states, 5 major self-governing territories, a federal district, and various possessions. At 9.8 million km2 (3.8 million square miles), it is the world’s 4th-largest country by total area. Most of the country’s area is located in central North America between Mexico and Canada. After China and India, the U.S. is the 3rd most populous country in the world with an estimated population of more than 328 million.

The capital of the US is Washington, D.C., and the most populous city is New York City.The United States is a founding member of the International Monetary Fund, United Nations, World Bank, NATO, Organization of American States (OAS), and other international organizations. It is also a permanent member of the United Nations Security Council. A highly developed country, the US is the world’s largest economy by nominal GDP, the 2nd-largest by PPP (purchasing power parity), and accounts for approximately one-fourth of the global GDP.

The country is also the world’s largest importer and the 2nd-largest exporter of goods, by value. The country holds 29.4% of the total wealth in the world, besides having only 4% of the world total population, the largest share of global wealth concentrated in a single country.