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usa - About USA Visa About USA Visa

About USA

usa - About USA Visa

United States of America

Capital Washington, D.C.
38°53′N 77°01′W
Largest city New York City
Official languages None at federal level
National language English
Demonym American
Government usa mapp - About USA Visa
Federal Presidential Constitutional
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
Total 9,826,675 km2 (3rd/4th)
3,794,101 sq mi
Water (%) 6.76
2013 estimate 317,566,000 (3rd)
Density 34.2/km2 (179th)
  88.6/sq mi
GDP(PPP) 2013 estimate
Total $16.724 trillion (1st)
Per capita $52,839 (6th)
GDP(nominal) 2013 estimate
Total $16.724 trillion (1st)
Per capita $52,839 (9th)
Gini(2011) 47.7
high • 39th (2009)
HDI (2013) 0.937
very high • 3rd
Currency United States dollar($)(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

The United States of America (USA), commonly referred to as the United States (US), America, or simply the States, is a federal republic consisting of 50 states and a federal district. The 48 contiguous states and the federal district of 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 country also has five populated and nine unpopulated territories in the Pacific and the Caribbean. At 3.79 million square miles (9.83 million km2) in total and with around 316 million people, the United States is the 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.

The United States is a developed country and has the world’s largest national economy, with an estimated GDP in 2013 of $16.7 trillion – 23% of global nominal GDP and 19% at purchasing-power parity. The economy is fueled by an abundance of natural resources and the world’s highest 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 second-highest median household income in the OECD as well as the highest average wage, though it has the fourth most unequal income distribution among OECD nations with roughly 16% of the population living in poverty. The country accounts for 39% 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.