Look, some of your Native American ancestors traveled back to Asia...
@diane
The remains of three people who died on a riverbank in the Kamchatka Peninsula in northeastern Siberia some 500 years ago have yielded a surprising secret: Their DNA shows they had some North American ancestry, according to a study published today. Considered alongside other ancient and modern genomes, the results suggest that although the ancestors of today’s Native Americans came from Asia, the passage was not one way. Instead, the Bering Sea region was a place of intercontinental connection, where people routinely boated back and forth for thousands of years.
“The idea of back migration makes the history of this area a bit more complex, but also a bit more realistic,” says Anders Götherström, a geneticist at Stockholm University who wasn’t involved in the work. “Humans have an amazing ability to get to places.”
It's like the Tarim mummies - ancient people apparently of Celtic origin in the middle of China. The old idea of people never getting more than a couple, three miles from home was only regarding farmers. They have to watch the crops! Everybody else can walk wherever they want. Or sail, if they've got the craft. There's lots of tales in the Pacific Northwest of Japanese sailors washing ashore in the area of...well, the same area they kept finding feet inside shoes.

Not dead, though! Did they go home? Nope. Neither did the boatload of Korean monks who disappeared into the east and never returned. They, according to Native lore, did show up in Washington State. Also very ancient people from Polynesia who were travelling by boat - trading in Southern California and the Mexican trade routes. That would be somewhat later. But, as the article says, people get places!
That's just the west side of this continent. I think people came from Europe, Middle East, Africa - you name it. Phoenicians, Vikings, they got everywhere. There was nothing very hidden about this hemisphere to anybody but Europeans of Columbus' time!
I still believe the old stories that the people here were always here. The Amazon forest is starting to show some very, very remarkable things along those lines. It would be interesting if this hemisphere turned out to be the center of the world after all!