The Beginning of North America
Main articles: Settlement of the Americas and Paleo-Indians See also: Genetic history of indigenous peoples of the AmericasThe specifics of Paleo-Indians migration to and throughout the Americas, including the exact dates and routes traveled, are subject to ongoing research and discussion. For years, the traditional theory has been that these early migrants moved into the Beringia land bridge between eastern Siberia and present-day Alaska around 40,000 — 17,000 years ago, when sea levels were significantly lowered due to the Quaternary glaciation. These people are believed to have followed herds of now-extinct pleistocene megafauna along ice-free corridors that stretched between the Laurentide and Cordilleran ice sheets. Another route proposed is that, either on foot or using primitive boats, they migrated down the Pacific coast to South America. Evidence of the latter would since have been covered by a sea level rise of hundreds of meters following the last ice age.
Archaeologists contend that Paleo-Indians migration out of Beringia (eastern Alaska), ranges from 40,000 to around 16,500 years ago. This time range is a hot source of debate and promises to continue as such for years to come. The few agreements achieved to date are the origin from Central Asia, with widespread habitation of the Americas during the end of the last glacial period, or more specifically what is known as the late glacial maximum, around 16,000 — 13,000 years before present. However, older alternative theories exist, including migration from Europe.
Stone tools, particularly projectile points and scrapers, are the primary evidence of the earliest human activity in the Americas. Crafted lithic flaked tools are used by archaeologists and anthropologists to classify cultural periods. Scientific evidence links indigenous Americans to Asian peoples, specifically eastern Siberian populations. Indigenous peoples of the Americas have been linked to North Asian populations by linguistic dialects, the distribution of blood types, and in genetic composition as reflected by molecular data, such as DNA. 8,000 BCE — 7,000 BCE (10,000 — 9,000 years ago) the climate stabilized, leading to a rise in population and lithic technology advances, resulting in a more sedentary lifestyle.
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