Wallace Map

Every now and then something old and interesting shows up. From
http://drbganimalpharm.blogspot.com/2011/06/human-dna-migration-and-how-to-extract.html

If we consider that a generation is 33 years, and if each couple produce 4 children, in one thousand years, we would have the earths population; therefor, each migratory group may not have been large.  This ma account for the similarity across each native culture. They all had a small group of common ancestors.