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This is USA.
For other uses, see US (disambiguation), USA (disambiguation), and United States
(disambiguation).
United States of America
Flag Great Seal
Motto:
"In God we trust" (official)[1][2][3]
"E pluribus unum" (Latin) (traditional)
"Out of many, one"
Anthem: "The Star-Spangled Banner"
Capital
Washington, D.C.
38°53′N 77°01′W38.883°N
77.017°W
Largest city
New York City
40°43′N 74°00′W40.717°N
74.000°W
Official languages None at federal level[a]
National language English[b]
Demonym American
Government
Federal presidential
constitutional republic
-
President Barack Obama (D)
-
Vice President Joe Biden (D)
- Speaker of the House John Boehner (R)
-
Chief Justice John Roberts
Legislature Congress
-
Upper house Senate
-
Lower house House of Representatives
Independence from Great Britain
-
Declared July 4, 1776
-
Recognized September 3, 1783
-
Constitution June 21, 1788
Area
-
Total
9,826,675 km2[4][c] (3rd/4th)
3,794,101 sq mi
-
Water (%) 6.76
Population
- 2013 estimate 317,888,000[5]
(3rd)
-
Density
34.2/km2 (180th)
88.6/sq mi
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 $52,852
[6] (9th)
Gini (2011) 47.7
[7]
high · 39th (2009)
HDI (2013) 0.937
[8]
very high · 3rd
Currency United States dollar ($) (USD)
Time zone (UTC−5 to −10)
-
Summer (DST) (UTC−4 to −10
[e])
Drives on the right[g]
Calling code +1
ISO 3166 code US
Internet TLD .us .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".[9]
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 percent of Americans aged five and older.
Spanish is the second most commonly spoken language.
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.
^ 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).
e.
^ See Time in the United States for details about laws governing time zones in
the United States.
f. ^ Does not include insular areas and United States Minor Outlying Islands,
which have their own ISO 3166 codes.
g. ^ Except U.S. Virgin Islands.
The United States of America (USA), commonly referred to as the United States (US),
America or simply the States, is a federal republic[10][11]
consisting of 50 states and a federal
district. The 48 contiguous states and the federal district of Washington, D.C., are in central
North America between Canada and Mexico. The state of Alaska is the northwestern part of
North America and the state of Hawaii is an archipelago in the mid-Pacific. The country also has
five populated and nine unpopulated territories in the Pacific and the Caribbean. At 3.79 million
square miles (9.83 million km2) in total and with around 317 million people, the United States is
the fourth-largest country by total area and third largest by population. It is one of the world's
most ethnically diverse and multicultural nations, the product of large-scale immigration from
many countries.[12]
The geography and climate of the United States is also extremely diverse, and
it is home to a wide variety of wildlife.
Paleo-indians migrated from Asia to what is now the U.S. mainland around 15,000 years ago,[13]
with European colonization beginning in the 16th century. The United States emerged from 13
British colonies located along the Atlantic seaboard. Disputes between Great Britain and these
colonies led to the American Revolution. On July 4, 1776, delegates from the 13 colonies
unanimously issued the Declaration of Independence. The ensuing war ended in 1783 with the
recognition of independence of the United States from the Kingdom of Great Britain, and was
the first successful war of independence against a European colonial empire.[14][15]
The current
Constitution was adopted on September 17, 1787. The first 10 amendments, collectively named
the Bill of Rights, were ratified in 1791 and guarantee many fundamental civil rights and
freedoms.
