Just because a population of people is high in rh negative blood doesn’t mean they necessarily descend from a population with equal or higher frequencies of rh negative blood. It could easily be, that they come from a group or groups of people with low rh negative frequencies, but that the rh negatives of that group were the ones who decided to pack their bags, look for a better life elsewhere and wound up forming a new tribe with a higher percentage of rh negative blood. Continue here… See also: More than half of the ancient Basques were rh negative Do you consider yourself to be a nomadic person?