President: Barack H. Obama (2009)
Vice President: Joseph Biden (2009)
Land area: 3,539,225 sq mi (9,166,601 sq km); total area: 3,718,691 sq mi (9,631,420 sq km)
Population (2014 est.): 318,892,103 (growth rate: 0.77%); birth rate: 13.42/1000; infant mortality rate: 6.17/1000; life expectancy: 79.56; density per sq mi: 88.6
Capital (2013 est.): Washington, DC, 646,449
Largest cities (2013 est.): New York, 8,405,837; Los Angeles, 3,884,307; Chicago, 2,718,782; Houston, 2,195,914; Philadelphia, 1,553,165
Monetary unit: dollar
The United States of America
Languages: English 82.1%, Spanish 10.7%, other Indo-European 3.8%, Asian and Pacific island 2.7%, other 0.7% (2000)
Ethnicity/race (2010 Census): White: 223,553,265 (72.4%); Black: 38,929,319 (12.6%); Asian: 14,674,252 (4.8%); American Indian and Alaska Native: 2,369,431 (0.8%); Native Hawaiian and other Pacific Islander: 1,225,195 (0.4%); Hispanic origin:1 50,477,594 (16.3%)
Religions: Protestant 51.3%, Roman Catholic 23.9%, Mormon 1.7%, other Christian 1.6%, Jewish 1.7%, Buddhist 0.7%, Muslim 0.6%, other or unspecified 2.5%, unaffiliated 12.1%, none 4% (2007)
Literacy rate: 99% (2003 est.)
Economic summary: GDP/PPP (2013 est.): $16.72 trillion; per capita $52,800. Real growth rate: 1.6%. Inflation: 1.5%. Unemployment: 7.3%. Arable land: 16.29%. Agriculture: wheat, corn, other grains, fruits, vegetables, cotton; beef, pork, poultry, dairy products; fish; forest products. Labor force: 155.4 million (2013 est., includes unemployed); farming, forestry, and fishing 0.7%, manufacturing, extraction, transportation, and crafts 20.3%, managerial, professional, and technical 37.3%, sales and office 24.2%, other services 17.6%; note: figures exclude the unemployed (2009). Industries: highly diversified, world leading, high-technology innovator, second largest industrial output in world; petroleum, steel, motor vehicles, aerospace, telecommunications, chemicals, electronics, food processing, consumer goods, lumber, mining. Natural resources: coal, copper, lead, molybdenum, phosphates, uranium, bauxite, gold, iron, mercury, nickel, potash, silver, tungsten, zinc, petroleum, natural gas, timber. Exports: $1.575 trillion (2013 est.): agricultural products 9.2% (soybeans, fruit, corn), industrial supplies 26.8% (organic chemicals), capital goods 49.0% (transistors, aircraft, motor vehicle parts, computers, telecommunications equipment), consumer goods 15.0% (automobiles, medicines) (2011). Imports: $2.273 trillion (2013 est.): agricultural products 4.9%, industrial supplies 32.9% (crude oil 8.2%), capital goods 30.4% (computers, telecommunications equipment, motor vehicle parts, office machines, electric power machinery), consumer goods 31.8% (automobiles, clothing, medicines, furniture, toys) (2011). Major trading partners: Canada, Mexico, Japan, China, Germany , Japan (2012).
Communications: Telephones: main lines in use: 139 million (2012); mobile cellular: 310 million (2012). Radio broadcast stations: AM about 5,000, FM about 10,000, shortwave 18 (2008). Radios: 575 million (2008). Television broadcast stations: more than 1,500 (including nearly 1,000 stations affiliated with the five major networks—NBC, ABC, CBS, FOX, and PBS; in addition, there are about 9,000 cable TV systems) (2008). Televisions: 498 million (2008). Internet Service Providers (ISPs): 505 million (2012 est.). Internet users: 245 million (2009).
Transportation: Railways: total: 224,792 km mainline routes (2007). Highways: total: 6,586,610 km; paved: 4,304,715 km (including 76,334 km of expressways); unpaved: 2,281,895 km (2012). Waterways: 41,009 km of navigable inland channels, exclusive of the Great Lakes (2012). Ports and harbors: Anchorage, Baltimore, Boston, Charleston, Chicago, Duluth, Hampton Roads, Honolulu, Houston, Jacksonville, Los Angeles, New Orleans, New York, Philadelphia, Port Canaveral, Portland (Oregon), Prudhoe Bay, San Francisco, Savannah, Seattle, Tampa, Toledo. Airports: 13,513 (2013).
International disputes: the US has intensified domestic security measures and is collaborating closely with its neighbors, Canada and Mexico, to monitor and control legal and illegal personnel, transport, and commodities across the international borders; abundant rainfall in recent years along much of the Mexico-US border region has ameliorated periodically strained water-sharing arrangements; 1990 Maritime Boundary Agreement in the Bering Sea still awaits Russian Duma ratification; Canada and the United States dispute how to divide the Beaufort Sea and the status of the Northwest Passage but continue to work cooperatively to survey the Arctic continental shelf; The Bahamas and US have not been able to agree on a maritime boundary; US Naval Base at Guantanamo Bay is leased from Cuba and only mutual agreement or US abandonment of the area can terminate the lease; Haiti claims US-administered Navassa Island; US has made no territorial claim in Antarctica (but has reserved the right to do so) and does not recognize the claims of any other states; Marshall Islands claims Wake Island; Tokelau included American Samoa's Swains Island among the islands listed in its 2006 draft constitution.
The president is elected for a four-year term and may be reelected only once. The bicameral Congress consists of the 100-member Senate, elected to a six-year term with one-third of the seats becoming vacant every two years, and the 435-member House of Representatives, elected every two years. The minimum voting age is 18.