Or more accurately, if it were genetic the races would look very different.
The genetic diversity of "black" alone exceeds the rest of the world combined.
So you have two choices:
1. Everybody is black.
2. The other races roughly stand, but there are dozens of different black races.
Or you can be more accurate and say race is cultural.
https://en.wikipedia.org/wiki/Human_Diversity_Foundation
edit since i was feeling really daring today i found an old archived page of a wiki holding a lot of interesting thoughts from him, such as eugenics to prevent the loss of western civilization, and other points that at this point you should imagine. link: https://web.archive.org/web/20250416005529/https:/rationalwi...