It's a fascinating subject isn't it ?.
I am giving the link about the Hopi, as it mentions Japan and the Native Americans
and another link about the blood groups ( the Basques being well known for their RH Neg blood )
The article again mentions migration patterns and what can happen.
As with the Basques, few Native Americans are group B, so they must have migrated to the Americas late enough to pick up the Rh positive gene, but too early to pick up the gene for B.