United States of America
Flag Great Seal
MottoIn God We Trust  (official)
E Pluribus Unum  (traditional)
(Latin: Out of Many, One)
AnthemThe Star-Spangled Banner
Capital Washington, D.C.
38°53′N 77°01′W / 38.883°N 77.017°W / 38.883; -77.017
Largest city New York City
Official language(s) None at federal level[a]
National language English (de facto)[b]
Demonym American
Government Federal constitutional presidential republic
 –  President Barack Obama (D)
 –  Vice President Joe Biden (D)
 –  Speaker of the House Nancy Pelosi (D)
 –  Chief Justice John Roberts
Independence from the Kingdom of Great Britain
 –  Declared July 4, 1776 
 –  Recognized September 3, 1783 
 –  Current constitution June 21, 1788 
 –  Total 9,826,675 km2 [1][c](3rd/4th)
3,794,101 sq mi 
 –  Water (%) 6.76
 –  2010 estimate 308,898,000[2] (3rd[d])
 –  2000 census 281,421,906[3] 
 –  Density 32/km2 (178th)
83/sq mi
GDP (PPP) 2008 estimate
 –  Total $14.441 trillion[4] (1st)
 –  Per capita $47,440[4] (6th)
GDP (nominal) 2008 estimate
 –  Total $14.441 trillion[4] (1st)
 –  Per capita $47,440[4] (17th)
Gini (2007) 45.0[1] (44th)
HDI (2007) ▲ 0.956[5] (very high) (13th)
Currency United States dollar ($) (USD)
Time zone (UTC−5 to −10)
 –  Summer (DST)  (UTC−4 to −10)
Date formats m/d/yy (AD)
Drives on the right
Internet TLD .us .gov .mil .edu
Calling code +1
^ a. English is the official language of at least 28 states—some sources give a higher figure, based on differing definitions of “official”.[6] English and Hawaiian are both official languages in the state of Hawaii.^ b. English is the de facto language of American government and the sole language spoken at home by 80% of Americans age five and older. Spanish is the second most commonly spoken language.

^ c. Whether the United States or the People’s Republic of China is larger is disputed. The figure given is from the U.S. Central Intelligence Agency‘s World Factbook. Other sources give smaller figures. All authoritative calculations of the country’s size include only the 50 states and the District of Columbia, not the territories.

^ d. The population estimate includes people whose usual residence is in the fifty states and the District of Columbia, including noncitizens. It does not include either those living in the territories, amounting to more than 4 million U.S. citizens (most in Puerto Rico), or U.S. citizens living outside the United States.


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