He is from three tribes and works in dc. Said the land bridge was a partly yes. That language shows that the great migrations were north to south and some south to north as shown with corn as not native to North America hence the ceremonies and great respect given to corn. And some tribes was working theory because of language was east coast to plains like dakotas. Kiowa came from far north. So put things together Siberian Mongolian languages within America’s. And no one knows estimation of how many in America’s in 1492. No one.