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United States of America
FlagGreat Seal
MottoIn God We Trust  (official)
E Pluribus Unum  (traditional)
(Latin: Out of Many, One)
Anthem"The Star-Spangled Banner"
CapitalWashington, D.C.
38°53′N77°01′W / 38.883°N 77.017°W / 38.883; -77.017
Largest cityNew York City
Official language(s)None at federal level[a]
National languageEnglish (de facto)[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
Independencefrom the Kingdom of Great Britain
 - DeclaredJuly 4, 1776 
 - RecognizedSeptember 3, 1783 
 - Current constitutionJune 21, 1788 
Area
 - Total9,826,675 km2 [1][c](3rd/4th)
3,794,101 sq mi 
 - Water (%)6.76
Population
 - 2010 census308,745,538[2] (April) 
 - Density33.7/km2 
87.4/sq mi
GDP (PPP)2009 estimate
 - Total$14.256 trillion[3] (1st)
 - Per capita$47,701[3] (6th)
GDP (nominal)2009 estimate
 - Total$14.256 trillion[3] (1st)
 - Per capita$46,381[3] (9th)
Gini (2007)45.0[1] (44th)
HDI (2010)increase 0.902[4] (very high) (4th)
CurrencyUnited States dollar ($) (USD)
Time zone(UTC−5 to −10)
 - Summer (DST) (UTC−4 to −10)
Date formatsm/d/yy (AD)
Drives on theright
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".[5] 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.

Source: CIA World Factbook
Unless otherwise noted, information in this page is accurate as of July 12, 2011


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