This is about RACE, not ethnicity. There is a difference between saying "I am black" and "I am a Kenyan", for instance. I do not believe that race exists. It is a made up social construct that has been historically used to divide people into groups based on what their ethnic origins appear to be. We are all the same species; there are just tendencies in appearance based on the area where one's ancestors lived (which is obviously due to adaptations to the environment).
I am not asking if the social phenomena of "race" exists, rather I am asking if this social phenomena has any basis in reality.