United States is a federal republic consisting of 50 states and a federal district. Except for Alaska (northern Canada) and Hawaii (Pacific Ocean), 48 other states and federal district located in North America. United States border with Mexico and the Gulf of Mexico in the south, and with Canada on the north and northwest (Alaska exclave). In the west the country borders the Pacific Ocean and on the east by the Atlantic Ocean. In addition, the United States also "has" some areas in the Caribbean and the Pacific, although the region is not part of the United States.
With a total area of 9.83 million km2 and a population of 309 million people, the United States is the largest state-3 or-4 based on the total land area and third largest based on population. The country is a multiethnic and multicultural country, which is caused by the influx of immigrants from around the world. [4] The United States economy is the world's largest economy, with gross domestic product (estimated 2008) of U.S. $ 14.4 trillion (one quarter of world GDP under par and a fifth based on purchasing power parity). [2] [5]
Before the arrival of Europeans, Americans have been inhabited by Indians for thousands of years. But Indian tribes population declined rapidly due to disease outbreaks and wars with European settlers. America was formed from 13 former British colony which gained independence on July 4, 1776. This new country and then won the war with Britain in the American Revolutionary War. [6] In the 19th century, the United States to expand massively, the Louisiana purchase from France, Alaska from Russia, and annexed areas of New Mexico property Mexico, Texas and California after the Mexican-American War.
Conflicts between the northern states to southern states on the question of states rights and slavery sparked the American Civil War in the 1860s. Northern states and then managed to win this war and defend the unity of the country. U.S. economy become the largest in the world since the 1870s. [7] The victory in the Spanish-American War and World War I lifted the United States as one of the world's military forces. In World War II, the United States became the first country to have nuclear weapons. The end of the Cold War and the collapse of the Soviet Union made the United States became the only world superpower and the leading edge in terms of military, economic, cultural, and political.
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