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United States of America
FlagGreat Seal
Motto: 
"E pluribus unum" (Latin)(traditional)
"Out of many, one"
Anthem: "The Star-Spangled Banner"
Projection of North America with the United States in green
CapitalWashington, D.C.
38°53′N77°01′W / 38.883°N 77.017°W / 38.883; -77.017
Largest cityNew York City
Official languagesNone at federal level[a]
National languageEnglish[b]
DemonymAmerican
GovernmentFederalpresidentialconstitutional republic
 - PresidentBarack Obama (D)
 - Vice PresidentJoe Biden (D)
 - Speaker of the HouseJohn Boehner (R)
 - Chief JusticeJohn Roberts
LegislatureCongress
 - Upper houseSenate
 - Lower houseHouse of Representatives
Independence from Great Britain
 - DeclaredJuly 4, 1776 
 - RecognizedSeptember 3, 1783 
 - ConstitutionJune 21, 1788 
Area
 - Total9,826,675 km2[4][c] (3rd/4th)
3,794,101 sq mi
 - Water (%)6.76
Population
 - 2013 estimate317,234,000[5] (3rd)
 - Density34.2/km2 (179th)
88.6/sq mi
GDP (PPP)2013 estimate
 - Total$16.724 trillion[6] (1st)
 - Per capita$52,839[6] (6th)
GDP (nominal)2013 estimate
 - Total$16.724 trillion[6] (1st)
 - Per capita$52,839[6] (9th)
Gini (2011)47.7[7]
high ·39th (2009)
HDI (2013)Increase 0.937[8]
very high ·3rd
CurrencyUnited States dollar ($) (USD)
Time zone(UTC−5 to −10)
 - Summer (DST) (UTC−4 to −10[e])
Drives on theright[g]
Calling code+1
ISO 3166 codeUS
Internet TLD.us   .gov   .mil   .edu
a.^ English is the official language of at least 28 states; some sources give higher figures, based on differing definitions of "official".[9] 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 percent of Americans aged five and older. Spanish is the second most commonly spoken language.
c.^ Whether the United States or China is larger has been disputed. The figure given is from the U.S. Central Intelligence Agency's The 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 is of people whose usual residence is within the 50 states and the District of Columbia, regardless of nationality. It does not include those living in the territories (over 4 million people, mostly in Puerto Rico).
e.^ See Time in the United States for details about laws governing time zones in the United States.
f.^ Does not include insular areas and United States Minor Outlying Islands, which have their own ISO 3166 codes.
g.^ Except U.S. Virgin Islands.

Source: CIA World Factbook
Unless otherwise noted, information in this page is accurate as of July 26, 2012


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