Simply Put

It goes back to German anthropologist Friedrich Blumenbach. In his work in the late 1700s and early 1800s, Blumenbach divided Homo sapiens into five distinct races based on their physical characteristics. There was the Mongolian, or “yellow,” race, the red American race, the brown Malayan race, the black Ethiopian race, and the white Caucasian race.

Wouldn't you know it, a champion of human rights and tolerance such as a German anthropologist comes up with racial labels for all of us humans. Man, I am at ease.