Or maybe a population of Eastern persons entered the Americas earlier than thought.
I doubt personally that people sailed or rafted or whatever over the Atlantic. Whilst sea levels in that era would have been lower due to the Ice Age, this wouldn't have affected the southern Atlantic that much. If we only discovered the maritime technology for long-distance ocean travel in the 1400s or so, then I doubt some of us in paleolithic times could raft thousands of miles in that period safely.
I doubt personally that people sailed or rafted or whatever over the Atlantic. Whilst sea levels in that era would have been lower due to the Ice Age, this wouldn't have affected the southern Atlantic that much. If we only discovered the maritime technology for long-distance ocean travel in the 1400s or so, then I doubt some of us in paleolithic times could raft thousands of miles in that period safely.