The United States of America is also called the USA, US, United States or sometimes America. On July 4, 1776, the Declaration of Independence was issued, establishing the United States of America that is why the US's independence day is July 4th. The US is the 3rd largest country in the world by land area (the largest is Russia and the second largest is Canada)and 3rd by population. On February 25, 2013, the estimated population of the US was 315,568,000(it has increased by about 15 million). The US is a diverse country with a multicultural society and people from all over the world. The US has the world's largest economy. The US developed the first nuclear weapons, using them on the Japanese cities of Hiroshima and Nagasaki near the end of World War 2 causing Japan to surrender. The Mississippi and Missouri Rivers combine to form the longest river system in the US and the fourth longest in the world.
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