The ones that stayed behind in North America were called "Indians" or "Native Americans." This group was largely wiped out by European colonization and disease.
The irony is: now the white immigrants in North America think these folks are an invasive species, though if anything, that honor unfortunately falls to us.
Right now they are just walking in a giant circle.
All this means, is Warren is more of a "real American" than Trump.

There is a newer theory that perhaps the first American settlers actually came the Southern route, arriving in South America by boat from the South Pacific Islands.