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In page Pre-Columbian trans-oceanic contact theories:

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Similar cultures of peoples across the Bering Strait in both Siberia and Alaska suggest human travel between the two places ever since the strait was formed.[1] After Paleo-Indians arrived during the Ice Age and began the settlement of the Americas, a second wave of people from Asia came to Alaska around 8000 BC. These "Na-Dene" peoples, who share many linguistic and genetic similarities not found in other parts of the Americas, populated the far north of the Americas and only made it as far south as Oasisamerica. It is suggested that by 4000 BC "Eskimo" peoples began coming to the Americas from Siberia. "Eskimo" tribes live today in both Asia and North America and there is much evidence they lived in Asia even in prehistoric times.[2]