That is a very good question. I am serious about this also, I get it.

I have seen maybe one my whole life, and he was black, not dark brown. I would imagine there would still be a few tribes in Africa that are "black", but for the most part inter-breading with lighter skin people has diluted skin color to make "black" people rare indeed. 200+ hundred years ago true black skin was more common. The same can be said for "true blondes" which are very rare also. Interbreeding has turned everyone's hair a shade of brown.