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
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 us of America (USA), ordinarily remarked because the us (US), America, or just the States, may be a federal republic consisting of fifty states and a administrative division. The forty eight contiguous states and also the administrative division of Washington, D.C., area unit in central North America between North American country and Mexico. The state of American state is that the northwestern a part of North America and also the state of Hawaii is associate solid ground within the mid-Pacific.
The country additionally has 5 inhabited and 9 unpeopled territories within the Pacific and also the Caribbean. At 3.79 million sq. miles (9.83 million km2) in total and with around 316 million individuals, the us is that the fourth-largest country by total space and third largest by population. it’s one among the world’s most ethnically various and ism nations, the merchandise of large-scale immigration from several countries. The earth science and climate of the us is additionally very various, and it’s home to a good type of life.
The us may be a developed country and has the world’s largest economic system, with associate calculable GDP in 2013 of $16.7 trillion – twenty third of worldwide nominal GDP and nineteen at purchasing-power parity. The economy is burning by associate abundance of natural resources and also the world’s highest employee productivity, with per capita GDP being the world’s sixth-highest in 2010.
While the U.S. economy is taken into account post-industrial, it continues to be one among the world’s largest makers. The U.S. has the best mean and second-highest median family financial gain within the OECD likewise because the highest average wage, although it’s the fourth most unequal financial gain distribution among OECD nations with roughly Sixteen Personality Factor Questionnaire of the population living in poorness. The country accounts for thirty ninth of worldwide military defrayment, being the world’s foremost economic and military power, a outstanding political and cultural force, and a frontrunner in research and technological innovation.
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