US

For alternative meanings, see the disambiguation page for US, USA, United States, or American.

United States of America

Flag Coat of Arms
Motto: E pluribus unum (1789 to present) (Latin: "Out of Many, One") In God We Trust (1956 to present)
Anthem: The Star-Spangled Banner
Capital	Washington, D.C. 38°53′ N 77°02′ W
Largest city	New York City
Official languages	None at federal level; English de facto
Government  • President  • Vice President	Federal republic George W. Bush (R) Dick Cheney (R)
Independence  • Declared  • Recognized Constitution  • Completed  • Ratified  • Effective	From Great Britain July 4, 1776 September 3, 1783 September 17, 1787 May 23, 1788 March 4, 1789
Area  • Total  • Water (%)	9,631,418 km² (3rd) 4.87%
Population  • 2005 est.  • 2000 census  • Density	297,700,000 (3rd) 281,421,906 32/km² (140th)
GDP (PPP)  • Total  • Per capita	2005 estimate $12,589,600 million (1st) $42,367 (2nd)
HDI (2003)	0.944 (10th) – high
Currency	Dollar ($) (USD)
Time zone  • Summer (DST)	(UTC-5 to -10) (UTC-4 to -10)
Internet TLD	.us .gov .edu .mil .um
Calling code	+1

The United States of America is a country situated primarily in North America. It comprises 50 states and one federal district, and has several territories. It is also referred to, with varying formality, as the United States, the U.S., the U.S.A., the States, America, or (poetically) Columbia.

Since the mid-20th century, following World War II, the United States has emerged as a dominant global influence in economic, political, military, scientific, technological, and cultural affairs. Because of its influence, the U.S. is considered a superpower and, particularly after the Cold War, a hyperpower by some.

The country celebrates its founding date as July 4, 1776, when the Second Continental Congress — representing thirteen British colonies — adopted the Declaration of Independence that rejected British authority in favor of self-determination. However, the structure of the government was profoundly changed in 1789, when the states replaced the Articles of Confederation with the United States Constitution. The date on which each of the fifty states adopted the Constitution is typically regarded as the date that state "entered the Union" to become part of the United States.

History

Prehistory

American history began with the migration of people from Asia across the Bering land bridge approximately 12,000 years ago following large animals that they hunted into the Americas. These Native Americans left evidence of their presence in petroglyphs, burial mounds, and other artifacts. It is estimated that 2–9 million people lived in the territory now occupied by the U.S. before that population was greatly diminisehd by European contact and the foreign diseases it brought. Some advanced societies were the Anasazi of the southwest, who inhabited Chaco Canyon, and the Woodland Indians, who built Cahokia, located near present-day St Louis, a city with a population of 40,000 at its peak in AD 1200.

Colonization by Europe

External visitors had arrived before, but it was not until the discovery voyages of Christopher Columbus in the late 1400s and early 1500s that European nations began to explore the land in earnest and settle there permanently. See Colonialism.

During the 1500s and 1600s, the Spanish settled parts of the present-day Southwest and Florida. The first successful English settlement was at Jamestown, Virginia, also in 1607. Within the next two decades, several Dutch settlements, including New Amsterdam (the predecessor to New York City), were established in what are now the states of New York and New Jersey. In 1637, Sweden established a colony at Fort Christina (in what is now Delaware), but lost the settlement to the Dutch in 1655.

This was followed by extensive British settlement of the east coast. The British colonists remained relatively undisturbed by their home country until after the French and Indian War, when France ceded Canada and the Great Lakes region to Britain. Britain then imposed taxes on the 13 colonies to pay for the war. The colonists widely resented the taxes because they were denied representation in the British Parliament. Tensions between Britain and the colonists increased, and the thirteen colonies eventually rebelled against British rule.

Nationhood

First President of the United States under the Constitution, George Washington (1789-1797).

In 1776, the 13 colonies Declared Independence from Great Britain and formed the United States, the world's first constitutional and democratic federal republic. The American Revolutionary War followed (1775 to 1783).

The original political structure was a confederation in 1777, ratified in 1781 as the Articles of Confederation. After long debate, this was supplanted in 1789 by the Constitution, which formed a more centralized federal government.

Civil War

From early colonial times, there was a shortage of labor, which encouraged unfree labor, particularly indentured servitude and slavery. By the mid-19th century, a major division over the issue of states' rights and the expansion of slavery came to a head.

The northern states had become opposed to slavery, while the southern states saw it as necessary for the continued success of southern agriculture and wanted it expanded to newer territories in the West. Several federal laws were passed in an attempt to settle the dispute, including the Missouri Compromise and the Compromise of 1850.

The dispute reached a crisis in 1861, when seven southern states seceded¹ from the Union and formed the Confederate States of America, leading to the Civil War. Soon after the war began, four more southern states seceded.

During the war, Abraham Lincoln issued the Emancipation Proclamation, mandating the freedom of all slaves in states in rebellion, though full emancipation did not take place until after the end of the war in 1865, the dissolution of the Confederacy, and the Thirteenth Amendment took effect. The Civil War effectively ended the question of a state's right to secede, and is widely accepted as a major turning point after which the federal government became more powerful than state governments.

Expansion

American westward expansion is idealized in Emanuel Leutze's famous painting Westward the Course of Empire Takes its Way (1861). The title of the painting, from a 1726 poem by Bishop Berkeley, was a phrase often quoted in the era of Manifest Destiny, expressing a widely held belief that civilization had steadily moved westward throughout history. (more)

During the 19th century, many new states were added to the original 13 as the nation expanded across the continent. Manifest Destiny was a philosophy that encouraged westward expansion in the United States: as the population of the Eastern states grew and as a steady increase of immigrants entered the country, settlers moved steadily westward across North America.

In the process, the U.S. displaced most American Indian nations. This displacement of American Indians continues to be a matter of contention in the U.S., with many tribes attempting to assert their original claims to various lands. In some areas American Indian populations had been reduced by foreign diseases contracted through contact with European settlers, and US settlers acquired those emptied lands. In other instances American Indians were removed from their traditional lands by force. Though some would say the U.S. was not a colonial power until it acquired territories in the Spanish-American War, the dominion exercised over land in North America the United States claimed is essentially colonial.

During this period, the nation also became an industrial power and a center for innovation and technological development.

The 20th Century

The 20th century has sometimes been termed "the American Century" because of the nation's influence on the world. Its relative influence was especially great because Europe, which had been the center of greatest influence, was largely destroyed during the world wars.

The U.S. fought in World War I and World War II on the side of the Allies. Between the wars, the most significant event was the Great Depression (1929 to 1939), which was compounded by drought and dust. Like the rest of the developed world, the U.S. was pulled out of the great depression by its mobalization for World War II.

The war left much of the developed world was in ruins, but the Americas were largely spared. By 1950, more than half of the global economy (as measured in GNP) was located in the U.S.

During the Cold War, the US was a major player in the Korean War and Vietnam War, and, along with the Soviet Union, was considered one of the world's two "superpowers". This period coincided with a major economic expansion. With the collapse of the Soviet Union, the US emerged as the world's leading economic and military power.

During the 1990s, the United States became more involved in police actions and peacekeeping, including actions in Kosovo, Haiti, Somalia and Liberia, and the first Persian Gulf War.

After attacks on the World Trade Center and the Pentagon on September 11, 2001, the United States and other allied nations declared themselves involved in what has come to be called the "War on Terrorism," which has included military action in Afghanistan and Iraq.

Government

The Constitution is the supreme law of the United States.

Main articles: Federal government of the United States, Politics of the United States & Law of the United States

Republic and suffrage

The United States is an example of a constitutional republic, with a government composed of and operating through a set of limited powers imposed by its design and enumerated in the United States Constitution. Specifically, the nation operates as a presidential democracy. There are three levels of government: federal, state, and local. Officials of each of these levels are either elected by eligible voters via secret ballot or appointed by other elected officials. Almost all electoral offices are decided in "first-past-the-post" elections, where a specific candidate who earns at least a plurality of the vote is elected to office, rather than a party being elected to a seat to which it may appoint an official. Americans enjoy almost universal suffrage from the age of 18 regardless of race, sex, or wealth. There are some limits, however: felons are disenfranchised and in some states former felons are likewise. Furthermore, the national representation of territories and the federal district of Washington, DC in Congress is limited: residents of the District of Columbia are subject to federal laws and federal taxes but their only Congressional representative is a non-voting delegate.

Federal government

The federal government is comprised of the Legislative Branch (led by Congress), the Executive Branch (led by the President), and the Judicial Branch (led by the Supreme Court). These three branches were designed to apply checks and balances on each other. The Constitution limits the powers of the federal government to defense, foreign affairs, the issuing and management of currency, the management of trade and relations between the states, and the protection of human rights. In addition to these explicitly stated powers, the federal government—with the assistance of the Supreme Court—has gradually extended these powers into such areas as welfare and education, on the basis of the "necessary and proper" clause of the Constitution.

Legislative Branch

The Congress of the United States is the legislative branch of the federal government of the United States. It is bicameral, comprising the House of Representatives and the Senate. The House of Representatives consists of 435 members, each of whom represents a congressional district and serves for a two-year term. House seats are apportioned among the states by population; in contrast, each state has two Senators, regardless of population. There are a total of 100 senators, who serve six-year terms. The powers of Congress are limited to those enumerated in the Constitution; all other powers are reserved to the states and the people. The Constitution also includes the