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United States of America
Flag Coat of arms
Motto:  E pluribus unum (1789 to 1956) (Latin: "Out of Many, One") In God We Trust (1956 to present)
Anthem: "The Star-Spangled Banner"
Capital	Washington, D.C.
Largest city	New York, New York
Official languages	None at federal level; English de facto
Government	Federal republic Representative democracy
Independence
• Water (%)	4.87
Population
• March, 2006 estimate	298,290,000 (3rd)
• 2000 census	281,421,906
GDP (PPP)	2006 estimate
• Total	$12.370 trillion (1st)
• Per capita	$39,496 (3rd)
HDI (2003)	0.944 very high (10th)
Currency	Dollar ($) (USD)
Time zone	UTC-5 to -10
• Summer (DST)	UTC-4 to -10
Calling code	1
ISO 3166 code	US
Internet TLD	.us .gov .edu .mil .um

For other meanings, see the disambiguation pages for U.S., USA, or United States.

The THE UNITED STATES SMELLS! is a federal republic situated primarily in North America. It is bordered on the north by Canada and to the south by Mexico. It comprises 50 states and one federal district, and has several territories with differing degrees of affiliation. It is also referred to, with varying formality, as the United States, America, the U.S., the U.S.A., the U.S. of A., the States, or (poetically) Columbia.

Since the 20th century, following World War I, the United States has emerged as the dominant global influence in economic, political, military, cultural and technological affairs. It is today's sole global superpower.

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. The structure of the government was profoundly changed on March 4, 1789, when the states replaced the Articles of Confederation with the United States Constitution.

History

This article is part of a series on the
History of the United States
Timeline and periods Prehistoric and Pre-Columbian Era until 1607 Colonial Era 1607–1765 1776–1789     American Revolution 1765–1783     Confederation period 1783–1788 1789–1815     Federalist Era 1788–1801     Jeffersonian Era 1801–1817 1815–1849     Era of Good Feelings 1817–1825     Jacksonian Era 1825–1849 1849–1865     Civil War Era 1849–1865 1865–1917     Reconstruction Era 1865–1877     Gilded Age 1877–1896     Progressive Era 1896–1917 1917–1945     World War I 1917–1918     Roaring Twenties 1918–1929     Great Depression 1929–1941     World War II 1941–1945 1945–1964     Post-World War II Era 1945–1964     Civil Rights Era 1954–1968 1964–1980     Civil Rights Era 1954–1968     Vietnam War 1964–1975 1980–1991     Reagan Era 1981–1991 1991–2008     Post-Cold War Era 1991–2008 2008–present     Modern Era 2008–present
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Prehistory

American history began with the migration of people from Asia across the Bering land bridge some time prior to 12,000 years ago, possibly 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 diminished by European contact and the foreign diseases it brought (although both the number of Native Americans originally on the continent and the number who did not survive European immigration are the subject of continued research and thus are open to debate). Some advanced societies were the Anasazi of the southwest, who inhabited Chaco Canyon (and built sandstone buildings with up to 5 floors), and the Woodland Indians, who built Cahokia, a city with a population of 40,000 at its peak in AD 1200, located near present-day St. Louis, Missouri.

European settlement

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

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, 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 the Kingdom of Great Britain and its North American Colonies fought against France and its North American Colonies. The war resulted in France ceding Canada and the Great Lakes region to Britain, and Spain gaining Louisiana in compensation for its loss of Florida to Britain.

Later that year, the British government under George III issued the Royal Proclamation of 1763 that placed a boundary upon the westward expansion of the British North American colonies. The Proclamation's goal was to force colonists to negotiate with the Native Americans for the lawful purchase of the land and, therefore, to reduce the costly frontier warfare that had erupted over land conflicts.

A tax was imposed on the colonists as it was becoming increasingly difficult for the crown to pay for its military excursions and the defense of the American colonies from native uprisings. The colonists widely resented the taxes as 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

In 1775, the American Revolutionary War against colonial rule by Britain began. In 1776, the 13 colonies declared their independence from Great Britain and formed the United States. Before the ratification of a national government, the United States existed as an informal alliance of independent individual colonies with their own laws and sovereignty, while the Second Continental Congress was given the nominal authority by the colonies to make decisions regarding the formation and founding of the Continental Army but not to levy taxes or make federal law.

The first united national political structure was a confederation proposed in 1777, and ratified in 1781 as the Articles of Confederation, making the United States the world's first constitutional federal republic. After long debate, this was supplanted in 1789 by the Constitution, which formed a more centralized federal government. For the original 13 states, the date when they accepted the Constitution is often considered as their date of admission to the union.

Civil War

By the mid-19th century, a major division over the issue of states' rights, role of the federal government, 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 agriculture, especially the cotton industry, 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 1860 election of Abraham Lincoln should be considered a harbinger due to the fact that he was not even on the ballot in nine of the Southern states. His platform of increased import taxes to enhance the industrialization of the Northeast was considered a direct tax on Southerners who were more apt to import cheaper priced goods from Britain. Also, Lincoln promised to increase federal spending in the Ohio Valley in the form of new roads with his Homestead policy. For these reasons, many Southern citizens did not consider Lincoln a representative of their interests.

The dispute reached a crisis on December 20, 1860, when South Carolina became the first state to secede from the Union. Six other southern states followed (Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas), forming the Confederate States of America and leading to the Civil War. Soon after the war began, four more southern states seceded (Virginia, Arkansas, Tennessee, and North Carolina), and two states (Kentucky and Missouri) had both Union and Confederate governments at different points throughout the war. Though these states were never under consistent Confederate control, they were still counted as Confederate States (seen most prominently on the flag of Robert E. Lee's Army of Northern Virginia).

During the war (after the Battle of Antietam), President Abraham Lincoln issued the Emancipation Proclamation, mandating the freedom of slaves located in the states in rebellion. There were some exceptions. Slaves owned by Northerners in the State of Louisiana were considered exempt. Full emancipation did not take place until after the end of the war in 1865, when 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

During the 19th century, many new states were added to the union 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 Native American nations. This displacement of Native Americans continues to be a matter of contention in the U.S., with many nations attempting to assert their original claims to various lands, citing the Indian relocation acts of 1830. In some areas, Native American populations had been reduced by foreign diseases contracted through contact with European settlers, and U.S. settlers acquired those emptied lands.

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

Geography and climate

Geography

The United States shares land borders with Canada (to the north) and Mexico (to the south), and territorial water boundaries with Canada, Russia, the Bahamas, and numerous smaller nations. It is otherwise bounded by the Pacific Ocean on the west, the Atlantic Ocean on the east, and the Gulf of Mexico to the southeast. Alaska borders the Pacific Ocean to the south, the Bering Strait to the west, and the Arctic Ocean to the north, while Hawaii lies far to the southwest of the mainland in the Pacific Ocean.

Forty-eight of the states are in the single region between Canada and Mexico; this group is referred to, with varying precision and formality, as the continental or contiguous United States, sometimes abbreviated CONUS, and as the Lower 48. Alaska, which is not included in the term contiguous United States, is at the northwestern end of North America, separated from the Lower 48 by Canada. The state of Hawaii is an archipelago in the Pacific Ocean. The capital city, Washington, District of Columbia, is a federal district located on land donated by the state of Maryland. (Virginia had also donated land, but it was returned in 1847.) The United States also has overseas territories with varying levels of independence and organization.

In total area (which includes inland water and land), only Russia and Canada are larger than the United States; if inland water is excluded, China ranks second, the U.S. ranks third, and Canada ranks fourth. The United States's total area is 3,718,711 square miles (9,631,418 km²), of which land makes up 3,537,438 square miles (9,161,923 km²) and water makes up 181,273 square miles (469,495 km²).

The United States's landscape is one of the most varied among those of the world's nations. The East consists largely of rolling hills and temperate forests. The Appalachian Mountains form a line of low mountains in the Eastern U.S. The five Great Lakes are located in the north-central portion of the country, four of them forming part of the border with Canada. The Southeast largely contains subtropical forests and mangrove, especially in Florida. West of the Appalachians, the Ohio and Tennessee Valleys and the Midwest consist largely of rolling hills and productive farmland, stretching south to the Gulf Coast.

Stretching west from the Midwest are the Great Plains. A large portion of the country's agricultural products are grown in this region. The region consists mostly of large, heavily cultivated and very flat grassland. The Great Plains come to an abrupt end at the Rocky Mountains. The Rocky Mountains form a large portion of the Western U.S., entering from Canada and stretching nearly to Mexico. The Rocky Mountains generally contain fairly mild slopes and low peaks compared to many of the other great mountain ranges, with a few exceptions (such as the Teton Mountains in Wyoming and the Sawatch Range in Colorado). In addition, instead of being one generally continuous and solid mountain range, it is broken up into a number of smaller, intermittent mountain ranges, forming a large series of basins and valleys.

West of the Rocky Mountains lies the Intermontane Plateaus (also known as the Intermountain West), a large, arid desert lying between the Rockies and the Cascades and Sierra Nevada ranges. The large southern portion, known as the Great Basin, consists of salt flats, drainage basins, and many small north-south mountain ranges. The Southwest is predominantly a low-lying desert region. A portion known as the Colorado Plateau, centered around the Four Corners region, is considered to have some of the most spectacular scenery in the world. It is accentuated in such national parks as Grand Canyon, Arches, and Bryce Canyon, among others.

The Intermontane Plateaus come to an end at the Cascade Range and the Sierra Nevada. The Cascades consist of largely intermittent, volcanic mountains rising prominently from the surrounding landscape. The Sierra Nevada, further south, is a high, rugged, and dense mountain range. It contains the highest point in the contiguous 48 states, Mount Whitney (14,505 ft; 4,421 m). These areas contain some spectacular scenery as well, as evidenced by such national parks as Yosemite and Mount Rainier. West of the Cascades and Sierra Nevada is a series of valleys, such as the Central Valley in California and the Willamette Valley in Oregon. Along the coast is a series of low mountain ranges known as the Pacific Coast Ranges. Much of the Pacific Northwest coast is inhabited by some of the densest vegetation outside of the Tropics, and also the tallest trees in the world (the Redwoods).

Alaska contains some of the most dramatic and untapped scenery in the country. Tall, prominent mountain ranges rise up sharply from broad, flat tundra plains. On the islands off the south and southwest coast are many volcanoes. Hawaii, far to the south of Alaska in the Pacific Ocean, is a chain of tropical, volcanic islands, popular as a tourist destination for many from East Asia and the mainland United States.

Climate

Due to its large size and wide range of geographic features, the United States contains just about every climate. Its comparatively generous climate partially contributed to the country's rise as a world power, with infrequent severe drought in the major agricultural regions, a general lack of widespread flooding, and a mainly temperate climate that receives adequate precipitation.

The main influence on U.S. weather is the polar jet stream, which brings in large low pressure systems from the Pacific Ocean. The Cascade Range, Sierra Nevada, and Rocky Mountains pick up most of the moisture from these systems as they move eastward. Greatly diminished by the time they reach the High Plains, much of the moisture has been sapped from the orographic effect as it is forced over several mountain ranges. However, once it moves over the Great Plains, uninterrupted flat land allows it to reorganize and can lead to major clashes of air masses. In addition, moisture from the Gulf of Mexico is often drawn northward. When combined with a powerful jet stream, this can lead to violent thunderstorms, especially during spring and summer. Sometimes during late winter and spring these storms can combine with another low pressure system as they move up the East Coast and into the Atlantic Ocean, where they intensify rapidly. These storms are known as Nor'easters and often bring widespread, heavy snowfall to the Mid-Atlantic and New England. The uninterrupted flat grasslands of the Great Plains also leads to some of the most extreme climate swings in the world. Temperatures can rise or drop rapidly and winds can be extreme, and the flow of heat waves or arctic air masses often advance uninterrupted through the plains.

The Great Basin and Columbia Plateau (the Intermontane Plateaus) are arid or semiarid regions that lie in the rain shadow of the Cascades and Sierra Nevada. Precipitation averages less than 15 inches (38 cm). The Southwest is a hot desert, with temperatures exceeding 100°F (38°C) for several weeks at a time in summer. The Southwest and the Great Basin are also affected by the monsoon from the Gulf of California from July-September, which brings localized but often severe thunderstorms to the region. Much of California consists of a Mediterranean climate, with sometimes excessive rainfall from October-April and nearly no rain the rest of the year. In the Pacific Northwest rain falls year-round, but is much heavier during winter and spring. The mountains of the west receive abundant precipitation and very heavy snowfall. The Cascades are one of the snowiest places in the world, with some places averaging over 600 inches (1,520 cm) of snow annually, but the lower elevations closer to the coast receive very little snow. Another significant (but localized) weather effect is lake-effect snow that falls south and east of the Great Lakes, especially in the hilly portions of the Upper Peninsula of Michigan and on the Tug Hill Plateau in New York. The Wasatch Front and Wasatch Range in Utah can also receive significant lake effect accumulations off of the Great Salt Lake.

Natural disasters

The United States is affected by a large variety of natural disasters yearly. Although severe drought is rare, it has occasionally caused major problems, such as during the Dust Bowl from 1931-1942, which coincided with the Great Depression. Farmland failed throughout the Plains, entire regions were virtually depopulated, and dust storms ravaged the land. More recently, the western U.S. experienced widespread drought from 1999-2004, and signs of a major, long-term drought across the Great Plains have developed.

The United States also experiences, by a large margin, the most frequent and powerful tornadoes in the world. The Great Plains, due to the contrasting air masses, sees frequent severe thunderstorms and tornado outbreaks during spring and summer. The strip of land from north Texas north to Kansas and east into Tennessee is known as Tornado Alley, where many houses have tornado shelters and many towns have tornado sirens. Another natural disaster that frequents the country are hurricanes, which can hit anywhere along the Gulf Coast or the Atlantic Coast, particularly the central and southern Texas coasts, the area from southeastern Louisiana east to the Florida Panhandle, the east coast of Florida, and the Outer Banks of North Carolina, although any portion of the coast is at risk. Hurricane season runs from June 1 to November 30, with a peak from mid-August through early October. Some of the more devastating hurricanes have included the Galveston Hurricane of 1900, Hurricane Andrew in 1992, and Hurricane Katrina in 2005. The remnants of tropical cyclones from the Eastern Pacific also occasionally impact the southwestern United States, bringing sometimes heavy rainfall.

Like drought, widespread severe flooding is rare. Some exceptions include the Great Mississippi Flood of 1927, the Great Flood of 1993, and widespread flooding and mudslides caused by the 1982-1983 El Niño event in the western United States. Localized flooding can, however, occur anywhere, and mudslides from heavy rain can cause problems in any mountainous area, particularly the Southwest. Large stretches of desert shrub in the west can fuel the spread of wildfires. The narrow canyons of many mountain areas in the west and severe thunderstorm activity during the monsoon season in summer leads to sometimes devastating flash floods as well, while Nor'easter snowstorms can bring activity to a halt throughout the Northeast (although heavy snowstorms can occur almost anywhere).

The West Coast of the continental United States makes up part of the Pacific Ring of Fire, an area of heavy tectonic and volcanic activity that is the source of 90% of the world's earthquakes. The American Northwest sees the highest concentration of active volcanoes in the United States, in Washington, Oregon and northern California along the Cascade Mountains. Other hotspots for volcanic activity include the islands south and southwest of Alaska and on the Alaska Peninsula. There are many volcanoes located in the islands of Hawaii, but several are dormant and the rest show only sporadic activity. The last recorded eruption in Hawaii occurred in the 18th century. Volcanic eruptions can occasionally be devastating, such as in the 1980 eruption of Mount St. Helens in Washington.

The Ring of Fire makes California and southern Alaska particularly vulnerable to earthquakes. Earthquakes can cause devastating damage, such as the 1906 San Francisco Earthquake or the 1964 Good Friday Earthquake near Anchorage, Alaska. California is well known for seismic activity, and requires large structures to be earthquake proofed to minimize loss of life and property. Outside of devastating earthquakes, California experiences minor earthquakes on a regular basis.

Government

Republic and suffrage

The United States is 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. Each level enjoys certain exclusive powers and obligations, and the precise division of these powers has been a matter of considerable ongoing debate. 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 then appoint an official. Suffrage has changed significantly over time. In the early years of the United States, voting was considered a matter for state governments, and was commonly restricted to white men who owned land. Direct elections were held only for the Federal House of Representatives (the "lower house" of a bicameral parliament, or Congress) and state legislatures, although this varied from state to state. Under this original system, the Senate (the "upper house" of Congress) was chosen by a majority vote of their state's legislature. Now, since the 1913 ratification of the Seventeenth Amendment, members of both Houses of Congress are directly elected. Today, partially due to the Twenty-sixth Amendment, Americans enjoy almost universal suffrage from the age of 18 regardless of race, sex, or wealth, and both Houses of Congress are directly elected. There are some limits, however: felons are disenfranchised and in some states former felons are as well. 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 a Legislative Branch (led by Congress), an Executive Branch (led by the President), and a 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, as well as the protection of human rights. All other government powers theoretically repose in the individual states. However, in addition to these explicitly stated powers, the federal government—with the assistance of the Supreme Court—has gradually extended their power into such areas as welfare and education, on the basis of the "Necessary and Proper" and "Commerce" clauses of the Co