Clovis culture
Genetic history of Indigenous peoples of the Americas: Research on mitochondrial DNA in 2014 has found that members of some native North American tribes have a maternal ancestry (called haplogroup X) that has a link to the maternal ancestors of some present-day individuals in western Asia and Europe - but the link is not strong. A variant of mitochondrial DNA called X2a found in many Native Americans has been traced to (or research shows that the variant comes from) western Eurasia, while not being found in eastern Eurasia.