The United States of America, referred to as the United States, [1] is composed of 50 states, constitutional federal republic composed of 1 Federal District and 20 American overseas territory. Is located in central North America, including Alaska and Hawaii. Northern border with Canada, south through the Gulf of Mexico, West Pacific, the east by the Atlantic. An area of about 9629000 square kilometers. [2]1776 year in July 4th, the Continental Congress in Philadelphia, through the "Declaration of independence", declaring the United States was born. Since 1870 the United States global economy was at first, the United States of America is a multicultural and multi-ethnic country, is one of the largest immigration country in the world; one of the permanent members of the UN Security council. After the Second World War, the United States and its allies to victory, so that the United States has laid a world superpower leadership. After the collapse of the Soviet Union, as the only superpower in the world, in the economic, political, technological, military, entertainment and many other fields have led the world. Young with the vigor, diversity and openness, the spirit of adventure and the creation of the United States of America
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