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usa About USA

About USA

usamap min - About USAThe United States of America (USA), commonly referred to as the United States (US), America, and sometimes the States, is a federal republic consisting of 50 states and a federal district. The 48 contiguous states and Washington, D.C., are in central North America between Canada and Mexico.

The state of Alaska is the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. The countr also has five populated and nine unpopulated territories in the Pacific and the Caribbean. At 3.71 million square miles (9.62 million km2) and with around 318 million people, the United States is the world’s third or fourth-largest country by total area and third-largest by population. It is one of the world’s most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The geography and climate of the United States is also extremely diverse, and it is home to a wide variety of wildlife.

Paleo-Indians migrated from Eurasia to what is now the U.S. mainland around 15,000 years ago, with European colonization beginning in the 16th century. The United States emerged from 13 British colonies located along the Atlantic seaboard. Disputes between Great Britain and these colonies led to the American Revolution. On July 4, 1776, as the colonies were fighting Great Britain in the American Revolutionary War, delegates from the 13 colonies unanimously issued the Declaration of Independence. The war ended in 1783 with the recognition of independence of the United States from the Kingdom of Great Britain, and was the first successful war of independence against a European colonial empire. The current Constitution was adopted on September 17, 1787. The first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and guarantee many fundamental civil rights and freedoms.

By the end of the 19th century, the United States extended into the Pacific Ocean, and its economy was the world’s largest. The Spanish–American War and World War I confirmed the country’s status as a global military power. The United States emerged from World War II as a global superpower, the first country with nuclear weapons, and a permanent member of the United Nations Security Council. The end of the Cold War and the dissolution of the Soviet Union left the United States as the sole superpower.

The United States is a developed country and has the world’s largest national economy, with an estimated GDP in 2013 of $16.8 trillion—23% of global nominal GDP and 19% at purchasing-power parity. The economy is fueled by an abundance of natural resources and high worker productivity, with per capita GDP being the world’s sixth-highest in 2010. While the U.S. economy is considered post-industrial, it continues to be one of the world’s largest manufacturers. The U.S. has the highest mean and fourth highest median household income in the OECD as well as the highest gross average wage, though it has the fourth most unequal income distribution, with roughly 15% of the population living in poverty as defined by the U.S. Census. The country accounts for 36.6% of global military spending, being the world’s foremost economic and military power, a prominent political and cultural force, and a leader in scientific research and technological innovation.

United States of America
usa2 min - About USA


usa3 min - About USA

Great Seal

Anthem:The Star-Spangled Banner

usa4 300x135 min - About USAThe United States and its territories.

Capital Washington,D.C.

38°53′N 77°01′W

Largest city New York City

40°43′N 74°00′W

Official languages None at federal level
National language English
Demonym American
Government Federalpresidential constitutional republic
President Barack Obama(D)
Vice President Joe Biden(D)
Speaker of the House John Boehner(R)
Chief Justice John Roberts
Legislature Congress
Upper house Senate
Lower house House of Representatives
Independence from Great Britain
Declared July 4, 1776
Recognized September 3,1783
Constitution June 21, 1788
Current Statehood August 21, 1959
Total 9,629,091 km2(3rd/4th)

3,717,813 sq mi

Water(%) 2.23
2014 estimate 318,429,000 (3rd)
Density 34.2/km2 (180th)

88.6/sq mi

GDP (PPP) 2014 estimate
Total $17.528 trillion (1st)
Per capita $54,980 (6th)
GDP(nominal) 2014 estimate
Total $17.528 trillion (1st)
Per capita $54,980 (9th)
HDI(2013) 0.937

very high·3rd

Currency United States dollar($)(USD)
Time zone (UTC−5 to −10)
Summer(DST) (UTC−4 to −10)
Drives on the Right
Calling code +1
ISO 3166 code US
Internet TLD .us .gov .mil .edu
English is the official language of at least 28 states; some sources give higher figures, based on differing definitions of “official”. English and Hawaiian are both official languages in the state of Hawaii. French is a de facto language in the states of Maine and Louisiana, while New Mexico state law grants Spanish a special status. Cherokee is an official language in the Cherokee Nation tribal jurisdiction area and in the United Keetoowah Band of Cherokee Indians based in east and northeast Oklahoma
English is the de facto language of American government and the sole language spoken at home by 80 percent of Americans aged five and older. 28 states and five territories have made English an official language.Other official languages include Hawaiian, Samoan, Chamorro, Carolinian, and Spanish.