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The United States of America (also known as the United States, the US, the USA,) is the name of a federal constitutional republic, consisting of 50 states and a federal district (Federal District of Columbia or DC). located almost entirely in North America, located between Canada and Mexico, respectively the Atlantic Ocean (east) and the Pacific Ocean (west). The state of Alaska is located in the northwestern tip of North America, between Canada to the east and the Behring Strait to the west. The state of Hawaii is an archipelago in the Pacific Ocean, located about 3,200 km southwest of southwestern California. The country also has territories in the Pacific and the Caribbean, respectively. Covering a total area of more than 9.83 million km2 (or about 3.79 million square miles), of which about 85% is the territory of the continental United States (Contiguous United States or often "The Lower 48"), the area of the United States is about 40 times larger than Romania's surface, being the third largest in the world. Its continental part measures more than 5,000 kilometers from the Atlantic Ocean (east) to the Pacific Ocean (west) and more than 2,000 kilometers from the Canadian border (north) to the Mexican border (south). With a population of over 312 million people, according to the 2010 census, the United States is not only the third largest country in the world, but also the third most populous country in the world. The United States is also one of the most ethnically and culturally diverse countries in the world, as people from all over the world have emigrated or continue to emigrate to the Union. [2] At $ 15.2 trillion in gross domestic product (also known as GNP), the U.S. economy is the largest in the world, accounting for about 22% of global nominal GNP and over 19% of GNP. nominal value taking into account the adjustments determined by purchasing power parity "