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



Projection of North America with the United States 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[a]
National languageEnglish[b]
Ethnic groups72.4% White
12.6% Black
2.9% Other/Multiracial
4.8% Asian
0.9% Native[4][c]
DemonymAmerican
GovernmentFederalpresidentialconstitutional republic
 • PresidentBarack Obama
 • Vice PresidentJoe Biden
 • Speaker of the HousePaul Ryan
 • Chief JusticeJohn Roberts
LegislatureCongress
 • Upper houseSenate
 • Lower houseHouse of Representatives
 • DeclarationJuly 4, 1776 
 • ConfederationMarch 1, 1781 
 • Treaty of ParisSeptember 3, 1783 
 • ConstitutionJune 21, 1788 
 • Last polity admittedMarch 24, 1976 
Area
 • Total area9,833,517 km2[5][d] (3rd/4th)
3,796,742 sq mi
 • Water (%)6.97
 • Total land area9,147,593 km2
3,531,905 sq mi
Population
 • 2016 estimate324,099,593[6] (3rd)
 • 2010 census309,349,689[7] (3rd)
 • Density35/km2 (180th)
90.6/sq mi
GDP (PPP)2016 estimate
 • Total$18.558 trillion[8] (2nd)
 • Per capita$57,220[8] (10th)
GDP (nominal)2016 estimate
 • Total$18.558 trillion[8] (1st)
 • Per capita$57,220[8] (6th)
Gini (2013)40.8[9][10][11]
medium
HDI (2014)Increase 0.915[12]
very high ·8th
CurrencyUnited States dollar ($) (USD)
Time zone(UTC−4 to −12, +10, +11)
 • Summer (DST) (UTC−4 to −10[e])
Date formatMM/DD/YYYY
Drives on theright[f]
Calling code+1
ISO 3166 codeUS
Internet TLD.us   .gov   .mil   .edu
a.^ English is the official language of 32 states; English and Hawaiian are both official languages in Hawaii, and English and 20 Native American languages are official in Alaska. Algonquian, Cherokee, and Sioux are among many other official languages in Native-controlled lands throughout the country. French is a de facto, but unofficial, language in Maine and Louisiana, while New Mexico law grants Spanish a special status.[13][14][15][16]
b.^ In five territories, English as well as one or more indigenous languages are official: Spanish in Puerto Rico, Samoan in American Samoa, Chamorro in both Guam and the Northern Mariana Islands. Carolinian is also an official language in the Northern Mariana Islands.
c.^ Not including Hispanic or Latino ethnicity, see Race and ethnicity in the United States for more information.
d.^ Whether the United States or China is larger has been disputed. The figure given is from the U.S. Census and United Nations.[17]
e.^ See Time in the United States for details about laws governing time zones in the United States.
f.^ Except American Samoa and the Virgin Islands.

Source: CIA World Factbook
Unless otherwise noted, information in this page is accurate as of October 9, 2016


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