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About USA
At 3.79 million square miles (9.83 million km2) and with over 309 million people, the United States is the third or fourth largest country by total area, and the third largest both by land area and population. It is one of the world's most ethically diverse and multicultural nations, the product of large-scale immigration from many countries. The U.S. economy is the world's largest national economy, with an estimated 2009 GDP of $14.3 trillion (a quarter of nominal global GDP) and a fifth of global GDP at purchasing powe parity*.*

The US has the largest and most technologically powerful economy in the world, with a per capita GDP of US$ 46,400. In this market-oriented economy, private individuals and business firms make most of the decisions. US business firms enjoy greater flexibility than their counterparts in Western Europe and Japan in decisions to expand capital plant, to lay off surplus workers, and to develop new products. US firms are at or near the forefront in technological advances, especially in computers and in medical, aerospace, and military equipment. **

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