See also: Outline of United States history

The first known inhabitants of what is now the United States are believed to have arrived over a period of several thousand years beginning sometime prior to 15,000–50,000 years ago by crossing Beringia into Alaska. These people are known as the Native Americans or, incorrectly, as "Indians". Solid evidence of these cultures settling in what would become United States territory is dated to around 14,000 years ago. Research has revealed much about the early Native American in North America. Christopher Columbus' men were the first documented settlers from the Old World to land in the territory of what is now the United States when they arrived in Puerto Rico during their second voyage in the year 1493. Juan Ponce de León, who arrived in Florida in 1513, is credited as being the first European to land in what is now the continental United States, although some evidence suggests that John Cabot might have reached what is presently New England in 1498.

The arrival of Europeans began the colonial history of the United States. The Thirteen Colonies, British colonies that would become the original US states, were founded along what is now the country's east coast beginning in 1607. Various other European powers also founded settlements in what would become US territory, both before and later. Due to growing dissatisfaction with British rule, the thirteen British colonies fought the British army in the American Revolutionary War of the 1770s and issued a Declaration of Independence in 1776. In early 1781, the Articles of Confederation and Perpetual Union of the States were established, six months before the end of hostilities in the Revolutionary War. Two years later, Britain officially recognized the sovereignty and independence of the United States in the Treaty of Paris. After the nation split along state lines in 1861, the Civil War—the deadliest war in US history—reunified the country. In the nineteenth century, westward expansion of United States territory began, encouraged by the belief in Manifest Destiny, in which the United States would occupy all of North America east to west, from the Atlantic to the Pacific Oceans. By 1912, with the admission of Arizona to the Union, the US reached that goal. The outlying states of Alaska and Hawaii were both admitted in 1959.

Ratified in 1788, the US Constitution serves as the supreme law in organizing the government; the Supreme Court is responsible for upholding Constitutional law. Many forms of social progress started in the nineteenth century; those advancements have been widely reflected in the Constitution. Slavery was abolished in 1865 by the Thirteenth Amendment to the United States Constitution; the following Fourteenth and Fifteenth Amendments respectively guaranteed citizenship for all persons naturalized within US territory and voting for people of all races. In later decades, civil rights were extended to women and African-Americans, following effective lobbying from social activists. The Nineteenth Amendment prohibited gender discrimination in voting rights; later, the Civil Rights Act of 1964 outlawed racial segregation in public places.

The Progressive Era marked a time of economic growth for the United States, advancing to the Roaring Twenties. However, the Wall Street Crash of 1929 led to the Great Depression, a time of economic downturn and mass unemployment. Consequently, the U.S. government established the New Deal, a series of reform programs that intended to assist those affected by the Depression. The New Deal had varied success. However, once the US entered World War II in December 1941, the economy quickly recovered, so much that the US became a world superpower by the dawn of the Cold War. During the Cold War, the US and the Soviet Union were the world's two superpowers, but with the end of the Cold War and the collapse of the Soviet Union, the United States became the world's only superpower.

Pre-Columbian period

Main article: Pre-Columbian

The earliest known inhabitants of what is now the United States are thought to have arrived in Alaska by crossing the Bering land bridge, at least 14,000 – 30,000 years ago. Some of these groups migrated south and east, and over time spread throughout the Americas. These were the ancestors to modern Native Americans in the United States and Alaskan Native peoples, as well as all indigenous peoples of the Americas.

Many indigenous peoples were semi-nomadic tribes of hunter-gatherers; others were sedentary and agricultural civilizations. Many formed new tribes or confederations in response to European colonization. Well-known groups included the Huron, Apache Tribe, Cherokee, Sioux, Delaware, Algonquin, Choctaw, Mohegan, Iroquois (which included the Mohawk nation, Oneida tribe, Seneca nation, Cayuga nation, Onondaga and later the Tuscarora tribe) and Inuit. Though not as technologically advanced as the Mesoamerican civilizations further south, there were extensive pre-Columbian sedentary societies in what is now the US. The Iroquois had a politically advanced and unique social structure that was at the very least inspirational if not directly influential to the later development of the democratic United States government, a departure from the strong monarchies from which the Europeans came.

North America's Moundbuilder Culture

Mound Builder is a general term referring to the original inhabitants who constructed various styles of earthen mounds for burial, residential and ceremonial purposes. These included Archaic, Woodland period (Adena and Hopewell cultures), and Mississippian period Pre-Columbian cultures dating from roughly 3000 BC to the 16th century AD, and living in the Great Lakes region, the Ohio River region, and the Mississippi River region.

Mound builder cultures can be divided into roughly three eras:

Poverty Point in what is now Louisiana is perhaps the most prominent example of early archaic mound builder construction (c. 2500 – 1000 BC). An even earlier example, Watson Brake, dates to approximately 3400 BC and coincides with the emergence of social complexity worldwide.

The Archaic period was followed by the Woodland period (c. 1000 BC). Some well-understood examples would be the Adena culture of Ohio and nearby states and the subsequent Hopewell culture known from Illinois to Ohio and renowned for their geometric earthworks. The Adena and Hopewell were not, however, the only mound building peoples during this time period. There were contemporaneous mound building cultures throughout the Eastern United States.

Main article: Mississippian Culture

Around 900 – 1450 AD the Mississippian culture developed and spread through the Eastern United States, primarily along the river valleys. The location where the Mississippian culture is first clearly developed is located in Illinois, and is referred to today as Cahokia.

Colonial period

Main article: Colonial history of the United States

After a period of exploration by people from various European countries, Spanish, Dutch, English, French, Swedish, and Portuguese settlements were established. Christopher Columbus first landed and encountered indigenous peoples, mainly the Arawak natives, on what is now the Bahama Islands. The natives were extremely friendly and were frequently remarked by European observers for their hospitality and belief in sharing. The Arawaks had lived in village communes, and had an advanced agriculture consisting of maize, yams, and cassava. They spun and wove textiles, however they had no work animals for labor. Columbus would later describe his initial encounter in his captain's log,

"They...brought us parrots and balls of cotton and spears and many other things, which they exchanged for the glass beads and hawks' bells. They willingly traded everything they owned... They were well-built, with good bodies and handsome features... They do not bear arms, and do not know them, for I showed them a sword, they took it by the edge and cut themselves out of ignorance. They have no iron. Their spears are made of cane.... They would make fine servants.... With fifty men we could subjugate them all and make them do whatever we want."

Columbus was the first European to set foot on what would one day become US territory when he came to Puerto Rico on November 19, 1493, during his second voyage.

In the 16th century, Europeans brought horses, cattle, and hogs to the Americas and, in turn, took back to Europe maize, potatoes, tobacco, beans, squash, and slave natives, many of whom died enroute.

Spanish colonization

See also: New Spain

Spanish explorers came to what is now the United States beginning with Christopher Columbus' second expedition, which reached Puerto Rico on November 19, 1493. The first confirmed landing in the continental US was by a Spaniard, Juan Ponce de León, who landed in 1513 on a lush shore he christened La Florida.

Within three decades of Ponce de León's landing, the Spanish became the first Europeans to reach the Appalachian Mountains, the Mississippi River, the Grand Canyon and the Great Plains. In 1540, Hernando de Soto undertook an extensive explora

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