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The United States of America is located in the middle of the North American continent, with Canada to the north and the United Mexican States to the south. The United States ranges from the Atlantic Ocean on the nation's east coast to the Pacific Ocean bordering the west, and also includes the state of Hawaii, a series of islands located in the Pacific Ocean, the state of Alaska located in the northwestern part of the continent above the Yukon, and numerous other holdings and territories.
The first known inhabitants of the area now known as the United States are believed to have arrived over a period of several thousand years beginning approximately 20,000 years ago by crossing the Bering land bridge into Alaska. The first solid evidence of these cultures settling in what would become the US begins as early as 15,000 years ago with the Clovis culture.
Relatively little is known of these early settlers compared to the Europeans who colonized the area after the first voyage of navigator Christopher Columbus in 1492 for Spain. Columbus' men were also the first documented Old Worlders to land in the territory of the United States when they arrived in Puerto Rico during their second voyage in 1493. The first European known to set foot in the continental U.S. was Juan Ponce de León, who arrived in Florida in 1513, though there is some evidence suggesting that he may have been preceded by John Cabot in 1497.
Archaeological as well as geological evidence suggests that the present-day United States was originally populated by people migrating from Asia starting some 20,000 years ago, entering North America via the Bering land bridge and possibly along the Northwest coast.[1] These people became the indigenous people who inhabited the Americas prior to the arrival of European explorers in the 1400s and who are now called Native Americans.
Many cultures thrived in the Americas before Europeans came, including the Anasazi in the southwest and the Adena Culture in the east. Several such societies and communities, over time, intensified this practice of established settlements, and grew to support sizeable and concentrated populations. Agriculture was independently developed in what is now the eastern United States as early as 2500 BC, based on the domestication of indigenous sunflower, squash and goosefoot.[2] Eventually, Mexican maize and legumes were adapted to the shorter summers of eastern North America and complimented the indigenous crops.
The first European contact with the Americas was with the Vikings in the year 1000. Leif Erikson established a short-lived settlement called Vinland in present day Newfoundland. It would be another 500 years before European contact would be made again.