Re: https://www.history.com/news/human-migration-americas-beringia
“No - The theory with near-unanimous support from both archeologists and geneticists is that the first humans to populate the Americas arrived on foot via a temporary land bridge.”
No, they came by boat. Human maritime expeditions go as far back as the Paleolithic. Just how did those pesky aborigines get to Australia and the Polynesians to Hawaii and Easter Island? How were Mediterranean islands populated? Sardinia has never has a land bridge and modern humans appeared in the island during the Upper Paleolithic, a phalanx dated to 18000 BC had been found in the Corbeddu cave, near Oliena.
Before roads there were boats, everything of significant weight and size was moved by boats. Wood was plentiful as were hides for sails. The fisheries of the ancient world were very, very productive and people sailed the ocean reaping the bounty long, long before a single word was ever written on stone.
The indians.