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United States of America
Motto: 
Other traditional mottos:
Anthem: 
Great Seal:
Projection of North America with the United States in green
The United States and its territories
The United States, including its territories
Capital
Largest city
Official languagesNone at federal level[a]
National languageEnglish
Ethnic groups
(2018)[7]
By race:
Ethnicity:
Demonym(s)American[b][8]
GovernmentFederal presidential constitutional republic
• President
Donald Trump (R)
Mike Pence (R)
Nancy Pelosi (D)
John Roberts
LegislatureCongress
Senate
House of Representatives
Independence 
July 4, 1776
March 1, 1781
September 3, 1783
June 21, 1788
September 25, 1789
August 21, 1959[d]
May 5, 1992
Area
• Total area
3,796,742 sq mi (9,833,520 km2)[e][9] (3rd/4th)
• Water (%)
6.97
• Total land area
3,531,905 sq mi (9,147,590 km2)
Population
• 2019 estimate
Increase 328,239,523[7] (3rd)
• 2010 census
308,745,538[f][10] (3rd)
• Density
87/sq mi (33.6/km2) (146th)
GDP (PPP)2020 estimate
• Total
Increase $22.321 trillion[11] (2nd)
• Per capita
Increase $67,426[11] (11th)
GDP (nominal)2020 estimate
• Total
Increase $22.321 trillion[11] (1st)
• Per capita
Increase $67,426[11] (7th)
Gini (2017)Positive decrease 39.0[12]
medium inequality (56th)
HDI (2018)Increase 0.920[13]
very high (15th)
Currency[[]] ($) (USD)
Time zoneUTC−4 to −12, +10, +11
• Summer (DST)
UTC−4 to −10[g]
Date format
  • mm/dd/yyyy
  • yyyy-mm-dd
Drives onright[h]
Calling code+1
ISO 3166 codeUS
Internet TLD
Generic top-level domain
.com, .org, .net, .edu, .gov, .mil
ccTLD (generally not used in the U.S.)
.us, .pr, .as, .gu, .mp, .vi and, formerly, .um (removed by ICANN in 2008, but still recognized by the U.S. government as a ccTLD)
  1. ^ 36 U.S.C. § 302
  2. ^ a b "The Great Seal of the United States" (PDF). U.S. Department of State, Bureau of Public Affairs. 2003. Retrieved February 12, 2020.
  3. ^ Kidder & Oppenheim 2007, p. 91.
  4. ^ "uscode.house.gov". Public Law 105-225. uscode.house.gov. August 12, 1999. pp. 112 Stat. 1263. Retrieved September 10, 2017. Section 304. "The composition by John Philip Sousa entitled 'The Stars and Stripes Forever' is the national march."
  5. ^ Cobarrubias 1983, p. 195.
  6. ^ García 2011, p. 167.
  7. ^ a b "U.S. Census Bureau QuickFacts: United States". United States Census. Retrieved January 21, 2020.
  8. ^ Compton's Pictured Encyclopedia and Fact-index: Ohio. 1963. p. 336.
  9. ^ Areas of the 50 states and the District of Columbia but not Puerto Rico nor other island territories per "State Area Measurements and Internal Point Coordinates". Census.gov. August 2010. Retrieved March 31, 2020. reflect base feature updates made in the MAF/TIGER database through August, 2010.
  10. ^ "Annual Estimates of the Resident Population: April 1, 2010 to July 1, 2016". United States Census. Archived from the original on February 14, 2020. Retrieved July 25, 2017. The 2016 estimate is as of July 1, 2016. The 2010 census is as of April 1, 2010.
  11. ^ a b c d "World Economic Outlook Database, October 2019". IMF.org. International Monetary Fund. Retrieved March 30, 2020.
  12. ^ "Income inequality". data.oecd.org. OECD. Retrieved January 8, 2020.
  13. ^ "Human Development Report 2019" (PDF). United Nations Development Programme. December 10, 2019. Retrieved December 10, 2019.


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