G08: Colonial America, Colonization or the Americas: Beringia Strait

According to most archeologists and geneticists, the best theory for how the first humans migrated to the Americas is the same one that many likely learned in grade school: they crossed the Bering Strait from Asia via a now-extinct land bridge.

The theory that the Americas were populated by humans crossing from Siberia to Alaska across a land bridge was first proposed as far back as 1590, and has been generally accepted since the 1930s.

But genetic evidence shows there is no direct ancestral link between the people of ancient East Asia and modern Native Americans. A comparison of DNA from 600 modern Native Americans with ancient DNA recovered from a late Stone Age human skeleton from Mal'ta near Lake Baikal in southern Siberia shows that Native Americans diverged genetically from their Asian ancestors around 25,000 years ago, just as the last ice age was reaching its peak.

Genetic evidence supports a theory that ancestors of Native Americans lived for 15,000 years on the Bering Land Bridge between Asia and North America until the last ice age ended

There is plenty of evidence to suggest that humans migrated to the North American continent via Beringia, a land mass that once bridged the sea between what is now Siberia and Alaska. But exactly who crossed, or recrossed, and who survived as ancestors of today’s Native Americans has been a matter of long debate.

Two new DNA studies sourced from rare fossils on both sides of the Bering Strait help write new chapters in the stories of these prehistoric peoples.