> A unique genetic marker exhumed from her 12,000-year-old skeleton offers evidence that the first hunter-gatherers who crossed the Bering Sea from northeast Asia on a now-submerged territory called Beringia belonged to the same population group as many Native Americans today...
Meaning that the 30,000 year old human activity in South America shows that the first (known) Americans spread north and across the Bering Sea into Asia. See, that’s how ya do that.