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 the fourth largest country 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.

People

More than 79% of the United States population are urban (and more than 50% are estimated to be suburban, a not strictly defined category that can be taken as a subset of urban), and the great majority of the inhabitants are of European descent. According to the U.S. census, as of 2000 the largest minority were Hispanics, who, at 35,305,818 people, accounted for 12.5% of the population; this figure includes people of Mexican, Puerto Rican, Cuban, and many other origins (who may be any race). The African-American population numbered 34,658,190, or 12.3% of the population, although an additional .6% of the population were of African-American descent in part. The Asian population totaled 10,242,998 in 2000, or 3.6%, and consisted predominantly of people of Chinese, Filipino, Indian, Vietnamese, Korean, or Japanese origin; an additional .6% of the population had a mixed-race background that was partially Asian. The Native American population of the United States, which included natives of Alaska such as Eskimos and Aleuts, was 2,475,956, or .9%, but an additional .6% were of partial Native American descent. Roughly a third of Native Americans lived on reservations, trust lands, territories, or other lands under Native American jurisdiction. Hawaiians and other Pacific Islanders numbered 398,835 in 2000, or .1% of the population; an additional .2% were of partial Pacific Island descent. Persons who defined themselves as being of mixed racial background constituted 2.4% of the population in 2000, but the number of people with a mixed racial background, especially in the African-American and Hispanic populations, was in fact much higher.
In addition to the original group of British settlers in the colonies of the Atlantic coast, numerous other national groups were introduced by immigration. Large numbers of Africans were transported in chains under abysmal conditions to work as slaves, chiefly on the plantations of the South. When the United States was developing rapidly with the settlement of the West (where some earlier groups of French and Spanish settlers were absorbed), immigrants from Europe poured into the land. An important early group was the Scotch-Irish. Just before the middle of the 19th cent., Irish and German immigrants were predominant. A little later the Scandinavian nations supplied many settlers.
After the Civil War, the immigrants came mainly from the nations of S and E Europe: from Italy, Greece, Russia, the part of Poland then in Russia, and from Austria-Hungary and the Balkans. During this period, there were also large numbers of immigrants from China. During the peak years of immigration between 1890 and 1924 more than 15 million immigrants arrived in the United States. After the immigration law of 1924 (see immigration), immigration was heavily restricted until the mid-1960s. Since the 1980s, large numbers of new immigrants have arrived. U.S. Census Bureau figures indicate that the proportion of foreign-born people in the U.S. population reached 11.1% in 2000, the highest it had been since the 1930 census; more than 40% of the more than 31 million foreign born had arrived since 1990. More than half of all foreign-born persons in the United States are from Latin America, and more than a quarter are from Asia.

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 motor vehicles, aircraft, food, iron and steel products, electric and electronic equipment, industrial and power-generating machinery, chemicals, and consumer goods. Leading imports include ores and metal scraps, petroleum and petroleum products, machinery, transportation equipment (especially automobiles), and paper and paper products. The major U.S. trading partners are Canada (in the world's largest bilateral trade relationship), Mexico, Japan, the United Kingdom, South Korea, and Germany. The volume of trade has been steadily increasing. The gross domestic product has continued to rise, and in 1998 it was easily the largest in the world at about $8.5 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 (including the Internet), 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.

Government

The government of the United States is that of a federal republic set up by the Constitution of the United States, adopted by the Constitutional Convention of 1787. There is a division of powers between the federal government and the state governments. The federal government consists of three branches: the executive, the legislative, and the judicial. The executive power is vested in the President and, in the event of the President's incapacity, the Vice President. (For a chronological list of all the presidents and vice presidents of the United States, including their terms in office and political parties, see the table entitled Presidents of the United States.) The executive conducts the administrative business of the nation with the aid of a cabinet composed of the Attorney General and the Secretaries of the Departments of State; Treasury; Defense; Interior; Agriculture; Commerce; Labor; Health and Human Services; Education; Housing and Urban Development; Transportation; Energy; and Veterans' Affairs.
The Congress of the United States, the legislative branch, is bicameral and consists of the Senate and the House of Representatives. The judicial branch is formed by the federal courts and headed by the U.S. Supreme Court. The members of the Congress are elected by universal suffrage (see election) as are the members of the electoral college, which formally chooses the President and the Vice President.

History

European Exploration and Settlement
Exploration of the area now included in the United States was spurred after Christopher Columbus, sailing for the Spanish monarchy, made his voyage in 1492. John Cabot explored the North American coast for England in 1498. Men who were important explorers for Spain in what now constitutes the United States include Ponce de León, Cabeza de Vaca, Hernando De Soto, and Coronado; important explorers for France were Giovanni da Verrazano, Samuel de Champlain, Louis Jolliet, Jacques Marquette, and La Salle. These three nations—England, Spain, and France—were the chief nations to establish colonies in the present United States, although others also took part, especially the Netherlands in the establishment of New Netherland (explored by Henry Hudson), which became New York, and Sweden in a colony on the Delaware River (see New Sweden).
The first permanent settlement in the present United States was Saint Augustine (Florida), founded in 1565 by the Spaniard Pedro Menéndez de Avilés. Spanish control came to be exercised over Florida, West Florida, Texas, and a large part of the Southwest, including California. For the purposes of finding precious metals and of converting heathens to Catholicism, the Spanish colonies in the present United States were relatively unfruitful and thus were never fully developed. The French established strongholds on the St. Lawrence River (Quebec and Montreal) and spread their influence over the Great Lakes country and along the Mississippi; the colony of Louisiana was a flourishing French settlement. The French government, like the Spanish, tolerated only the Catholic faith, and it implanted the rigid and feudalistic seignorial system of France in its North American possessions. Partly for these reasons, the French settlements attracted few colonists.
The English settlements, which were on the Atlantic seaboard, developed in patterns more suitable to the New World, with greater religious freedom and economic opportunity. The first permanent English settlement was made at Jamestown (Virginia) in 1607. The first English settlements in Virginia were managed by a chartered commercial company, the Virginia Company; economic motives were paramount to the company in founding the settlements. The Virginia colony early passed to control by the crown and became a characteristic type of English colony—the royal colony. Another type—the corporate colony—was initiated by the settlement of the Pilgrims at Plymouth Colony in 1620 and by the establishment of the more important Massachusetts Bay colony by the Puritans in 1630.
Religious motives were important in the founding of these colonies. The colonists of Massachusetts Bay brought with them from England the charter and the governing corporation of the colony, which thus became a corporate one, i.e., one controlled by its own resident corporation. The corporate status of the Plymouth Colony, evinced in the Mayflower Compact, was established by the purchase (1626) of company and charter from the holders in England. Connecticut and Rhode Island, which were offshoots of Massachusetts, owed allegiance to no English company; their corporate character was confirmed by royal charters, granted to Connecticut in 1662 and to Rhode Island in 1663. A third type of colony was the proprietary, founded by lords proprietors under quasi-feudal grants from the king; prime examples are Maryland (under the Calvert family) and Pennsylvania (under William Penn).
The religious and political turmoil of the Puritan Revolution in England, as well as the repression of the Huguenots in France, helped to stimulate emigration to the English colonies. Hopes of economic betterment brought thousands from England as well as a number from Germany and other continental countries. To obtain passage across the Atlantic, the poor often indentured themselves to masters in the colonies for a specified number of years. The colonial population was also swelled by criminals transported from England as a means of punishment. Once established as freedmen, former bondsmen and transportees were frequently allotted land with which to make their way in the New World.