Yes, we absolutely do. There are lots of other sea fairing cultures that managed to turn inland.

I’m sorry, it’s just completely implausible that there were people in America for ten thousand years without making any movement inland. Not only does it not make any sense, all the evidence we do have that maybe they were already on America comes from sites very far inland. Following your logic they made it to New Mexico and then back leaving only a single set of footprints behind. And never left the sea shore again? No.