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At 3.7 million square miles (9.6 million km²) and with over 300 million people, the United States is the third or fourth largest country by total area, and third largest by land area and population.[5] The United States is one of the world's most ethnically diverse nations, the product of large-scale Immigration from many countries.[6] Its national economy is the largest in the world, with a nominal 2006 gross domestic product (GDP) of more than US$13 trillion.[2]

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16y ago

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