At 3.79 million square miles and with over 310 million people, the United States is the fourth largest country by total area, and the third largest both by land area and population. Its capital is Washington DC
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The United States of America (also referred to as the United States, the US, the USA, or America) is a federal constitutional republic containing fifty states and a federal district. It is one of the world's most ethnically diverse and multi cultural nations, the product of large-scale immigration from many countries.
The United States was founded by thirteen British colonies located along the Atlantic seaboard. On July 4, 1776, they issued the Declaration of Independence, which proclaimed their right to self-rule and their establishment of a cooperative union.