If the evidence in Brazil is the oldest, I kinda like this west africa to Brazil theory. The shortest distance (other than across Scandanavia to Greenland to Iceland to Vineland) is from the west african bulge to the Brazilian bulge.
I can then see migrations south and over to Chile and up the west coast of SA. Or up the nile and over the Andes? Etc, etc. That would account for inca, mayan and then US Indians.
I like this stuff. That stuff in New England is virtually unknown except to Blue State Bluenoses, kinda a cult.
yitbos
There's no reason that people could not have come to the Americas from all over the world. We aren't limited to just one migration source.