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United States of America
FlagGreat Seal
Anthem: "The Star-Spangled Banner"

March: "The Stars and Stripes Forever"[3]

Projection of North America with the United States in green
The contiguous United States plus Alaska and Hawaii in green
The United States and its territories
The United States and its territories
CapitalWashington, D.C.
38°53′N77°01′W / 38.883°N 77.017°W / 38.883; -77.017
Largest cityNew York City
40°43′N74°00′W / 40.717°N 74.000°W / 40.717; -74.000
Official languagesNone at federal level
Recognised regional languages
National languageEnglish[b]
GovernmentFederalpresidentialconstitutional republic
 - PresidentBarack Obama
 - Vice PresidentJoe Biden
 - Speaker of the HouseJohn Boehner
 - Chief JusticeJohn Roberts
 - Upper houseSenate
 - Lower houseHouse of Representatives
 - DeclarationJuly 4, 1776 
 - ConfederationMarch 1, 1781 
 - Treaty of ParisSeptember 3, 1783 
 - ConstitutionJune 21, 1788 
 - Last state admissionAugust 21, 1959 
 - Total Area9,826,675 km2[4][c] (3rd/4th)
3,794,100 sq mi
 - Water (%)6.7
 - Total Land Area9,161,966 km2
3,537,500 sq mi
 - 2015 estimate321,163,157[5] (3rd)
 - Density35/km2 (180th)
90.6/sq mi
GDP (PPP)2014 estimate
 - Total$17.418 trillion[6] (2nd)
 - Per capita$54,596[6] (10th)
GDP (nominal)2014 estimate
 - Total$17.418 trillion[6] (1st)
 - Per capita$54,596[6] (10th)
Gini (2013)38.0[7][8][9]
HDI (2013)Steady 0.914[10]
very high ·5th
CurrencyUnited States dollar ($) (USD)
Time zone(UTC−5 to −10)
 - Summer (DST) (UTC−4 to −10[d])
AntipodesIndian Ocean
Île Amsterdam
Île Saint-Paul
Kerguelen Islands
Date formatMM/DD/YYYY
Drives on theright[e]
Calling code+1
ISO 3166 codeUS
Internet   .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".[11] English and Hawaiian are both official languages in the state of Hawaii. French is a de facto language in the states of Maine and Louisiana, while New Mexico state law grants Spanish a special status.[12][13][14][15]
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. 28 states and five territories have made English an official language. Other official languages include Hawaiian, Samoan, Chamorro, Carolinian.
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.^ See Time in the United States for details about laws governing time zones in the United States.
e.^ Except the United States Virgin Islands.

Source: CIA World Factbook
Unless otherwise noted, information in this page is accurate as of June 30, 2015

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