"Humans are 99.9% identical genetically. Of the tiny amount of difference that exists, 85% is found in any local group, be they Italians, Kurds, or Cherokees. For example, two random Koreans are likely to be genetically different as a Korean and Italian." This is explained in the film The Power of an Illusion (2003.)
Adelman, L. (Producer and Co-Director). (2003). The Power of an Illusion. [Motion picture]. San Francisco, CA: California Newsreel.