United States has a 9.63 million sq km. Has a population of 313 million people. A large space is the three or four most populous in the world and is the world's # 3. A country in which there are a variety of differences in ethnicity and culture. As a result of immigration from many countries. Geography and climate of the United States also has a variety of extremes is wildlife. United States economy is the largest in the world. Rate of the gross domestic product. When the year 2551 than 14.4 trillion (the rate of gross domestic product, representing 15 percent of # 5 in the world and of gross domestic product in purchasing power parity).
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