Where did the Native American people come from, and how did they get to America?

Native Americans descended from people who migrated out of northeast Asia, crossing into North America over a vast land mass called Beringia, where the Bering Strait sits today, at least 15,000 to 21,000 years ago.

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The land bridge they walked across

About 20,000 years ago, at the peak of the last Ice Age, Earth's water was locked in massive glaciers, dropping sea levels roughly 120 meters lower than today. That exposed the continental shelves, connecting Siberia and Alaska as one landmass. Scientists call that land Beringia.

The people who walked across it didn't know they were crossing continents. There were no borders, no maps, no concept of continents. The migrations were most likely driven by the search for food, as these groups hunted large mammals that inhabited the region. They followed the animals, and in doing so, they walked into an entirely new world.

As ice sheets melted and sea levels rose at the end of the last Ice Age, the land bridge became submerged, and corridors opened in the interior and maritime regions of western Canada, effectively reconnecting eastern Beringia to the rest of North America. Once through, people expanded southward along a route that hugged the coast, with populations splitting off along the way.

Where they came from before that

Genetic evidence shows that Native Americans most likely had a common Siberian origin. About 23,000 years ago, a single group splintered off from an East Asian population. Genetic data point to a population linked to ancient groups from northern Asia and Beringia. During the Last Glacial Maximum, this population developed several distinct lineages, including Ancient Native Americans and Ancient Beringians.

About 13,000 years ago, Native Americans started to split into different groups, creating the genetic and cultural diversity that exists today.

Was it one migration or several?

Mostly one, but the story is more layered than that. Scientists at UCL found that Indigenous Australians populations across the Americas arose from at least 3 migrations, with the majority descended from a single group of migrants. That single group of First American migrants crossed through Beringia, and while most Native American populations arose from that first migration, two subsequent migrations also made important genetic contributions.

Some Amazonian Native Americans descend partly from a founding population that carried ancestry more closely related to Indigenous Australians, New Guineans and Andaman Islanders than to any present-day Eurasians or other Native Americans. This signature is not present in the same way in Northern and Central Americans, suggesting a more diverse set of founding populations than previously accepted.

How fast did they spread?

Remarkably fast. The close genetic affinities found at similar times across vast distances suggest people moved rapidly across the Americas, with little time to evolve into distinct genetic groups. Some researchers argue that Clovis technology, a distinctive style of stone spear point, may have spurred this rapid expansion. Clovis points, the earliest widely recognized tool tradition in the Americas, have been found from New Mexico to Patagonia.

Archaeological evidence suggests that these early Paleo-Indians spread throughout the Americas, diversifying into numerous culturally distinct nations. Major Paleo-Indian cultures included the Clovis and Folsom traditions, identified through unique spear points and large-game hunting methods.

That is the story of Pocahontas's own most distant ancestors, and of every Native American people: not people who were always here in a static sense, but the descendants of extraordinary travelers who made humanity's last great continental crossing on foot, in ice, following animals into a world no human had ever seen.

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