Government

Federal republic.

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.

Geography

United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and in area. It consists of 50 states and a federal district. The conterminous (excluding Alaska and Hawaii) United States stretches across central North America from the Atlantic Ocean on the east to the Pacific Ocean on the west, and from Canada on the north to Mexico and the Gulf of Mexico on the south. The state of Alaska is located in extreme NW North America between the Arctic and Pacific oceans and is bordered by Canada on the east. The state of Hawaii, an island chain, is situated in the E central Pacific Ocean c.2,100 mi (3,400 km) SW of San Francisco. Washington, D.C., is the capital of the United States, and New York is its largest city.

The outlying territories and areas of the United States include: in the Caribbean Basin, Puerto Rico (a commonwealth associated with the United States) and the Virgin Islands of the United States (purchased from Denmark in 1917); in the Pacific Ocean, Guam (ceded by Spain after the Spanish-American War), the Northern Mariana Islands (a commonwealth associated with the United States), American Samoa, Wake Island, and several other islands. The United States also has compacts of free association with the Republic of the Marshall Islands, the Republic of Palau, and the Federated States of Micronesia.

Economy

The mineral and agricultural resources of the United States are tremendous. Although the country was virtually self-sufficient in the past, increasing consumption, especially of energy, continues to make it dependent on certain imports. It is, nevertheless, the world's largest producer of both electrical and nuclear energy. It leads all nations in the production of liquid natural gas, aluminum, sulfur, phosphates, and salt. It is also a leading producer of copper, gold, coal, crude oil, nitrogen, iron ore, silver, uranium, lead, zinc, mica, molybdenum, and magnesium. Although its output has declined, the United States is among the world leaders in the production of pig iron and ferroalloys, steel, motor vehicles, and synthetic rubber. Agriculturally, the United States is first in the production of cheese, corn, soybeans, and tobacco. The United States is also one of the largest producers of cattle, hogs, cow's milk, butter, cotton, oats, wheat, barley, and sugar; it is the world's leading exporter of wheat and corn and ranks third in rice exports. In 1995, U.S. fisheries ranked fifth in the world in total production.

Major U.S. exports include aircraft, motor vehicles and parts, food, iron and steel products, electric and electronic equipment, industrial and power-generating machinery, organic chemicals, transistors, telecommunications equipment, pharmaceuticals, and consumer goods. Leading imports include ores and metal scraps, petroleum and petroleum products, machinery, transportation equipment (especially automobiles), food, clothing, computers, and paper and paper products. The major U.S. trading partners are Canada (in the world's largest bilateral trade relationship), Mexico, China, Japan, Great Britain, Germany, and South Korea. Despite the steady growth in imports, the gross domestic product also has continued to rise, and in 2006 it was easily the largest in the world at about $13 trillion. The development of the economy has been spurred by the growth of a complex network of communications not only by railroad, highways, inland waterways, and air but also by telephone, radio, television, computer and fax machine. This infrastructure has fostered not only agricultural and manufacturing growth but has also contributed to the leading position the United States holds in world tourism revenues and to the ongoing shift to a service-based economy. In 1996 some 74% of Americans worked in service industries, a proportion matched, among major economic powers, only by Canada.