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The United States of America (U.S.A. or USA), commonly known as the United States (U.S., US or the States), or simply America, is a sovereign country mostly in North America. It is divided into 50 states. Forty-eight of these states and the District of Columbia border each other between the Pacific and Atlantic Oceans. They are bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwestern area of the continent and is separated from the other 48 states by Canada making it an exclave. Alaska is bordered by Canada to its east and south and by Russia to its west across the Bering Strait. The state of Hawaii is a set of islands in the mid-Pacific located within Polynesia and is about 2,200 miles (3,500 kilometers) from the mainland. The country also possesses territories, and insular areas, in the Caribbean and Pacific. The capital city is Washington, D.C and the largest city by population is New York City with a population of 8.8 million people. And with a population of 331 million people, the United States is the third most populated country in the world. And with an area 3.79 million square miles (9.83 million km²) it is the third or fourth-largest country in the world by total area.