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Native American and European contact
The first North American settlers migrated from Siberia by way of the Bering land bridge approximately 15,000 or more years ago. Some, such as the pre-Columbian Mississippian culture, developed advanced agriculture, grand architecture, and state-level societies. After European explorers and traders made the first contacts, the native population declined due to various reasons, including diseases such as smallpox and measles, intermarriage, and violence.

In the early days of colonization many settlers were subject to shortages of food, disease and attacks from Native Americans. Native Americans were also often at war with neighboring tribes and allied with Europeans in their colonial wars. At the same time however many natives and settlers came to depend on each other. Settlers traded for food and animal pelts, natives for guns, ammunition and other European wares. Natives taught many settlers where, when and how to cultivate corn, beans and squash in the frontier. European missionaries and others felt it was important to "civilize" the Indians and urged them to concentrate on farming and ranching without depending on hunting and gathering.

Settlements
After Columbus' first voyage to the New World in 1492 other explorers and settlement followed into the Floridas and the American Southwest. There were also some French attempts to colonize the east coast, and later more successful settlements along the Mississippi River. Successful English settlement on the eastern coast of North America began with the Virginia Colony in 1607 at Jamestown and the Pilgrims' Plymouth Colony in 1620. Early experiments in communal living failed until the introduction of private farm holdings. The continent's first elected legislative assembly, Virginia's House of Burgesses created in 1619, and the Mayflower Compact, signed by the Pilgrims before disembarking, established precedents for the pattern of representative self-government and constitutionalism that would develop throughout the American colonies.

Most settlers in every colony were small farmers, but other industries developed. Cash crops included tobacco, rice and wheat. Extraction industries grew up in furs, fishing and lumber. Manufacturers produced rum and ships and by the late colonial period Americans were producing one-seventh of the world's iron supply. Cities eventually dotted the coast to support local economies and serve as trade hubs. English colonists were supplemented by waves of Scotch-Irish and other groups. As coastal land grew more expensive freed indentured servants pushed further west. Slave cultivation of cash crops began with the Spanish in the 1500s, and was adopted by the English, but life expectancy was much higher in North America because of less disease and better food and treatment, so the numbers of slaves grew rapidly. Colonial society was largely divided over the religious and moral implications of slavery and colonies passed acts for and against the practice. But by the turn of the 18th century, African slaves were replacing indentured servants for cash crop labor, especially in southern regions.

With the 1732 colonization of Georgia, the 13 colonies that would become the United States of America were established. All had local governments with elections open to most free men, with a growing devotion to the ancient rights of Englishmen and a sense of self-government stimulating support for republicanism. With extremely high birth rates, low death rates, and steady settlement, the colonial population grew rapidly. Relatively small Native American populations were eclipsed. The Christian revivalist movement of the 1730s and 1740s known as the Great Awakening fueled interest in both religion and religious liberty.

In the French and Indian War, British forces seized Canada from the French, but the francophone population remained politically isolated from the southern colonies. Excluding the Native Americans, who were being conquered and displaced, those 13 colonies had a population of over 2.1 million in 1770, about one-third that of Britain. Despite continuing new arrivals, the rate of natural increase was such that by the 1770s only a small minority of Americans had been born overseas. The colonies' distance from Britain had allowed the development of self-government, but their success motivated monarchs to periodically seek to reassert Royal authority.

Independence and expansion


The American Revolutionary War was the first successful colonial war of independence against a European power. Americans had developed an ideology of "republicanism" that held government rested on the will of the people as expressed in their local legislatures. They demanded their rights as Englishmen, “no taxation without representation”. The British insisted on administering the empire through Parliament, and the conflict escalated into war. The Congress adopted the Declaration of Independence, on July 4, 1776, proclaiming that humanity is created equal in their inalienable rights. That date is now celebrated annually as America's Independence Day. In 1777, the Articles of Confederation established a weak government that operated until 1789.

Britain recognized the independence of the United States following their defeat at Yorktown. In the peace treaty of 1783, American sovereignty was recognized from the Atlantic coast west to the Mississippi River. Nationalists led the Philadelphia Convention of 1787 in writing the United States Constitution, and it was ratified in state conventions in 1788. The federal government was reorganized into three branches for their checks and balances in 1789. George Washington, who had led the revolutionary army to victory, was the first president elected under the new constitution. The Bill of Rights, forbidding federal restriction of personal freedoms and guaranteeing a range of legal protections, was adopted in 1791.

Although the federal government criminalized the international slave trade in 1808, after 1820 cultivation of the highly profitable cotton crop exploded in the Deep South, and along with it the slave population. The Second Great Awakening, beginning about 1800, converted millions to evangelical Protestantism. In the North it energized multiple social reform movements, including abolitionism, in the South, Methodists and Baptists proselytized among slave populations.

Americans' eagerness to expand westward prompted a long series of Indian Wars. The Louisiana Purchase of French-claimed territory in 1803 almost doubled the nation's size. The War of 1812, declared against Britain over various grievances and fought to a draw, strengthened U.S. nationalism. A series of U.S. military incursions into Florida led Spain to cede it and other Gulf Coast territory in 1819. Expansion was aided by steam power, when steamboats began traveling along America's large water systems, which were connected by new canals, such as the Erie and the I&M; then, even faster railroads began their stretch across the nation's land.

From 1820 to 1850, Jacksonian democracy began a set of reforms which included wider male suffrage, and it led to the rise of the Second Party System of Democrats and Whigs as the dominant parties from 1828 to 1854. The Trail of Tears in the 1830s exemplified the Indian removal policy that moved Indians into the west to their own reservations. The U.S. annexed the Republic of Texas in 1845 during a period of expansionist Manifest Destiny. The 1846 Oregon Treaty with Britain led to U.S. control of the present-day American Northwest. Victory in the Mexican-American War resulted in the 1848 Mexican Cession of California and much of the present-day American Southwest.

The California Gold Rush of 1848–49 spurred western migration and the creation of additional western states. After the American Civil War, new transcontinental railways made relocation easier for settlers, expanded internal trade and increased conflicts with Native Americans. Over a half-century, the loss of the buffalo was an existential blow to many Plains Indians cultures. In 1869, a new Peace Policy sought to protect Native-Americans from abuses, avoid further warfare, and secure their eventual U.S. citizenship.

Civil War and Reconstruction Era


From the beginning of the United States, inherent divisions over slavery between the North and the South in American society ultimately led to the American Civil War. Initially states entering the Union alternated slave and free, keeping a sectional balance in the Senate, while free states outstripped slave states in population and in the House of Representatives. But with additional western territory and more free-soil states, tensions between slave and free states mounted with arguments over federalism and disposition of the territories, whether and how to expand or restrict slavery.

Following the 1860 election of Abraham Lincoln, the first president from the largely anti-slavery Republican Party, conventions in thirteen states ultimately declared secession and formed the Confederate States of America, while the U.S. federal government maintained secession was illegal. The ensuing war was at first for Union, then after 1863 as casualties mounted and Lincoln delivered his Emancipation Proclamation, a second war aim became abolition of slavery. The war remains the deadliest military conflict in American history, resulting in the deaths of approximately 618,000 soldiers as well as many civilians.

Following the Union victory in 1865, three amendments to the U.S. Constitution prohibited slavery, made the nearly four million African Americans who had been slaves U.S. citizens, and promised them voting rights. The war and its resolution led to a substantial increase in federal power aimed at reintegrating and rebuilding the Southern states while ensuring the rights of the newly freed slaves. But following the Reconstruction Era, throughout the South Jim Crow laws soon effectively disenfranchised most blacks and some poor whites. Over the subsequent decades, in both the north and south blacks and some whites faced systemic discrimination, including racial segregation and occasional vigilante violence, sparking national movements against these abuses.

Industrialization
In the North, urbanization and an unprecedented influx of immigrants from Southern and Eastern Europe supplied a surplus of labor for the country's industrialization and transformed its culture. National infrastructure including telegraph and transcontinental railroads spurred economic growth and greater settlement and development of the American Old West. The later invention of electric lights and telephones would also impact communication and urban life. The end of the Indian Wars further expanded acreage under mechanical cultivation, increasing surpluses for international markets. Mainland expansion was completed by the Alaska Purchase from Russia in 1867. In 1898 the U.S. entered the world stage with important sugar production and strategic facilities acquired in Hawaii. Puerto Rico, Guam, and the Philippines were ceded by Spain in the same year, following the Spanish American War.

Rapid economic development at the end of the 19th century produced many prominent industrialists, and the U.S. economy became the world's largest. Dramatic changes were accompanied by social unrest and the rise of populist, socialist, and anarchist movements. This period eventually ended with the beginning of the Progressive Era, which saw significant reforms in many societal areas, including women's suffrage, alcohol prohibition, regulation of consumer goods, greater antitrust measures to ensure competition and attention to worker conditions.

World War I, Great Depression, and World War II
The United States remained neutral at the outbreak of World War I in 1914, though by 1917, it joined the Allies, helping to turn the tide against the Central Powers. President Woodrow Wilson took a leading diplomatic role at the Paris Peace Conference of 1919 and advocated strongly for the U.S. to join the League of Nations. However, the Senate refused to approve this, and did not ratify the Treaty of Versailles that established the League of Nations.

In 1920, the women's rights movement won passage of a constitutional amendment granting women's suffrage. The 1920s and 1930s saw the rise of radio for mass communication and the invention of early television. The prosperity of the Roaring Twenties ended with the Wall Street Crash of 1929 and the onset of the Great Depression. After his election as president in 1932, Franklin D. Roosevelt responded with the New Deal, which included the establishment of the Social Security system. The Dust Bowl of the mid-1930s impoverished many farming communities and spurred a new wave of western migration.

The United States was at first effectively neutral during World War II's early stages but began supplying material to the Allies in March 1941 through the Lend-Lease program. On December 7, 1941, the Empire of Japan launched a surprise attack on Pearl Harbor, prompting the United States to join the Allies against the Axis powers. Though the nation lost more than 400,000 soldiers, it emerged relatively undamaged from the war with even greater economic and military influence. Allied conferences at Bretton Woods and Yalta outlined a new system of international organizations that placed the United States and Soviet Union at the center of world affairs. As an Allied victory was won in Europe, a 1945 international conference held in San Francisco produced the United Nations Charter, which became active after the war. The United States developed the first nuclear weapons and used them on Japan; the Japanese surrendered on September 2, ending World War II.

Cold War and Civil Rights era


After World War II the United States and the Soviet Union jockeyed for power during what is known as the Cold War, driven by an ideological divide between capitalism and communism. They dominated the military affairs of Europe, with the U.S. and its NATO allies on one side and the USSR and its Warsaw Pact allies on the other. The U.S. developed a policy of "containment" toward Soviet bloc expansion. While they engaged in proxy wars and developed powerful nuclear arsenals, the two countries avoided direct military conflict. The U.S. often opposed Third World left-wing movements that it viewed as Soviet-sponsored. American troops fought Communist Chinese and North Korean forces in the Korean War of 1950–53. The Soviet Union's 1957 launch of the first artificial satellite and its 1961 launch of the first manned spaceflight initiated a "Space Race" in which the United States became the first to land a man on the moon in 1969. A proxy war was expanded in Southeast Asia with the Vietnam War.

At home, the U.S. experienced sustained economic expansion and a rapid growth of its population and middle class. Construction of an interstate highway system transformed the nation’s infrastructure over the following decades. Millions moved from farms and inner cities to large suburban housing developments. A growing Civil Rights movement used nonviolence to confront segregation and discrimination, with Martin Luther King Jr. becoming a prominent leader and figurehead. A combination of court decisions and legislation, culminating in the Civil Rights Act of 1964, sought to end racial discrimination. Meanwhile, a counterculture movement grew which was fueled by opposition to the Vietnam war, black nationalism, and the sexual revolution. The launch of a "War on Poverty" expanded entitlement and welfare spending.

The 1970s and early 1980s saw the onset of stagflation. After his election in 1980, President Ronald Reagan responded to economic stagnation with free-market oriented reforms. Following the collapse of détente, he abandoned "containment" and initiated the more aggressive "rollback" strategy towards the USSR. After a surge in female labor participation over the previous decade, by 1985 a majority of women age 16 and over were employed. The late 1980s brought a "thaw" in relations with the USSR, and its collapse in 1991 finally ended the Cold War.

Contemporary history
After the Cold War, the 1990s saw the longest economic expansion in modern U.S. history, ending in 2001. Originating in U.S. defense networks, the Internet spread to international academic networks, and then to the public in the 1990s, greatly impacting the global economy, society, and culture. On September 11, 2001, al-Qaeda terrorists struck the World Trade Center in New York City and the Pentagon near Washington, D.C., killing nearly 3,000 people. In response the United States launched the War on Terror, which includes the ongoing war in Afghanistan and the 2003–11 Iraq War. In 2008, amid the Great Recession, Barack Obama was elected president, becoming the first African-American to take the office.