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This article is about the United States of America. For other uses of terms redirecting here, see US (disambiguation), USA (disambiguation), and United States (disambiguation).
United States of America

Flag
Great Seal


Motto: In God We Trust (official)
E Pluribus Unum (traditional)
(Latin: Out of Many, One)

Anthem: "The Star-Spangled Banner"


Capital Washington, D.C.
38°53′N 77°01′W

Largest city New York City

Official language(s) None at federal level[a]

National language
English (de facto)[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 the Kingdom of Great Britain

- Declared
July 4, 1776
- Recognized
September 3, 1783
- Current constitution
June 21, 1788
Area

- Total 9,826,675 km2 [1][c](3rd/4th)
3,794,101 sq mi
- Water (%) 6.76
Population

- 2012 estimate 313,668,000[2] (3rd)

- Density 33.7/km2
87.4/sq mi
GDP (PPP)
2011 estimate
- Total $15.094 trillion[3] (1st)

- Per capita $48,386[3] (6th)

GDP (nominal)
2011 estimate
- Total $15.094 trillion[3] (1st)

- Per capita $48,386[3] (15th)

Gini (2007)
45.0[1] (39th)

HDI (2011)
0.910[4] (very high) (4th)

Currency United States dollar ($) (USD)

Time zone (UTC−5 to −10)

- Summer (DST)
(UTC−4 to −10)

Date formats m/d/yy (AD)

Drives on the right
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 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 (mostly in Puerto Rico), or U.S. citizens living outside the United States.
The United States of America (commonly abbreviated to the United States, the U.S., the USA, America, and the States) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west, across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean.
At 3.79 million square miles (9.83 million km2) and with over 312 million people, the United States is the third or fourth largest country by total area, and the third largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries.[6] The U.S. economy is the world's largest national economy, with an estimated 2011 GDP of $15.1 trillion (22% of nominal global GDP and over 19% of global GDP at purchasing-power parity).[3][7] Per capita income is the world's sixth-highest.[3]
Indigenous peoples descended from forebears who migrated from Asia have inhabited what is now the mainland United States for many thousands of years. This Native American population was greatly reduced by disease and warfare after European contact. The United States was founded by thirteen British colonies located along the Atlantic seaboard. On July 4, 1776, they issued the Declaration of Independence, which proclaimed their right to self-determination and their establishment of a cooperative union. The rebellious states defeated the British Empire in the American Revolution, the first successful colonial war of independence.[8] The current United States Constitution was adopted on September 17, 1787; its ratification the following year made the states part of a single republic with a stronger central government. The Bill of Rights, comprising ten constitutional amendments guaranteeing many fundamental civil rights and freedoms, was ratified in 1791.
Through the 19th century, the United States displaced native tribes, acquired the Louisiana territory from France, Florida from Spain, part of the Oregon Country from the United Kingdom, Alta California and New Mexico from Mexico, and Alaska from Russia, and annexed the Republic of Texas and the Republic of Hawaii. Disputes between the agrarian South and industrial North over the expansion of the institution of slavery and states' rights provoked the Civil War of the 1860s. The North's victory prevented a permanent split of the country and led to the end of legal slavery in the United States. By the 1870s, its national economy was the world's largest.[9] The Spanish–American War and World War I confirmed the country's status as a military power. It emerged from World War II as the first country with nuclear weapons and a permanent member of the United Nations Security Council. The end of the Cold War and the dissolution of the Soviet Union left the United States as the sole superpower. The country accounts for 41% of global military spending,[10] and is a leading economic, political, and cultural force in the world.[11]
Science and technology


A photograph from Apollo 11 of Buzz Aldrin on the surface of the Moon
Main article: Science and technology in the United States
See also: Technological and industrial history of the United States
The United States has been a leader in scientific research and technological innovation since the late 19th century. In 1876, Alexander Graham Bell was awarded the first U.S. patent for the telephone. Thomas Edison's laboratory developed the phonograph, the first long-lasting light bulb, and the first viable movie camera. Nikola Tesla pioneered alternating current, the AC motor, and radio. In the early 20th century, the automobile companies of Ransom E. Olds and Henry Ford popularized the assembly line. The Wright brothers, in 1903, made the first sustained and controlled heavier-than-air powered flight.[122]
The rise of Nazism in the 1930s led many European scientists, including Albert Einstein, Enrico Fermi, and John von Neumann, to immigrate to the United States. During World War II, the Manhattan Project developed nuclear weapons, ushering in the Atomic Age. The Space Race produced rapid advances in rocketry, materials science, and computers. IBM, Apple Computer, and Microsoft refined and popularized the personal computer. The United States largely developed the ARPANET and its successor, the Internet. Today, 64% of research and development funding comes from the private sector.[123] The United States leads the world in scientific research papers and impact factor.[124] As of April 2010, 68% of American households had broadband Internet service.[125] The country is the primary developer and grower of genetically modified food, representing half of the world's biotech crops.[126]

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