313 million people in the United States has a population. Make the largest area, with 3 or 4 of the most populous in the world and is the world's # 3. As a country in which there are a variety of differences in ethnicity and culture. As a result of immigrants from many countries [11]. Geography and climate of the United States, there are also a variety of extremes and to wildlife. As the United States economy, national economy, the largest in the world. Rate of gross domestic product. Last year more than us $ 14.4 trillion 2551 (rate of gross domestic product, representing 15 percent of the world, and no. 5 in gross domestic product in purchasing power parity).
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