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United States of America
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′N 77°01′W / 38.883°N 77.017°W / 38.883; -77.017
Largest cityNew York City
40°43′N 74°00′W / 40.717°N 74.000°W / 40.717; -74.000
Official languagesNone at federal level[a]
National languageEnglish[b]
Demonym(s)American
GovernmentFederal presidential constitutional republic
• President
Barack Obama (D)
Joe Biden (D)
John Boehner (R)
John Roberts
LegislatureCongress
Senate
House of Representatives
Independence 
• Declared
July 4, 1776
September 3, 1783
June 21, 1788
Area
• Total
9,826,675 km2 (3,794,100 sq mi)[4][c] (3rd/4th)
• Water (%)
6.76
Population
• 2013 estimate
337,233,000[5] (3rd)
• Density
34.2/km2 (88.6/sq mi) (180th)
GDP (PPP)2013 estimate
• Total
$16.799 trillion[6] (1st)
• Per capita
$52,852[6] (7th)
GDP (nominal)2013 estimate
• Total
$16.799 trillion[6] (1st)
• Per capita
$52,852[6] (9th)
Gini (2011)47.7[7]
high inequality (39th (2009))
HDI (2013)Increase 0.937[8]
very high (3rd)
Currency[[]] ($) (USD)
Time zoneUTC−5 to −10
• Summer (DST)
UTC−4 to −10[e]
Drives onright[g]
Calling code+1
ISO 3166 codeUS
Internet TLD.us   .gov   .mil   .edu
  1. ^ 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.
  2. ^ 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 5 territories have made English an official language. Other official languages include Hawaiian, Samoan, Chamorro, Carolinian, and Spanish.
  3. ^ 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.
  4. ^ 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).
  5. ^ See Time in the United States for details about laws governing time zones in the United States.
  6. ^ Does not include insular areas and United States Minor Outlying Islands, which have their own ISO 3166 codes.
  7. ^ Except U.S. Virgin Islands.
  1. ^ 36 U.S.C. § 302 National motto
  2. ^ Simonson, 2010
  3. ^ Dept. of Treasury, 2011
  4. ^ Cite error: The named reference WF was invoked but never defined (see the help page).
  5. ^ "U.S. POPClock Projection". U.S. Census Bureau. (figure updated automatically).
  6. ^ a b c d "World Economic Outlook Database: United States". International Monetary Fund. April 2014. Retrieved April 9, 2014.
  7. ^ "Income, Poverty and Health Insurance Coverage in the United States: 2011". Newsroom. United States Census Bureau. September 12, 2012. Retrieved January 23, 2013.
  8. ^ "Human Development Report 2013" (PDF). United Nations Development Programme. March 14, 2013. Retrieved March 14, 2013.
  9. ^ Cite error: The named reference ILW was invoked but never defined (see the help page).
  10. ^ "Ecological Footprint Atlas 2010" (PDF). Global Footprint Network. Retrieved July 11, 2011.