In the past all humans started off as African. Some stayed in Africa some went to other places. The question is are all Humans still related.
Every human in the world was African. Even Caucasians, Asians, even British were African at first. The reason we all changed skin color is because of what environment they were in.
Basically Neanderthals were also humans. The reason they changed was because they were in a different terrain. The weird at some point Neanderthals had sex with the other version of animals.
The Present People of The United states
The funny thing mostly all races have neanderthal blood except for African/African Americans. The reason that is because, Africans didn't have sex with Neanderthals. Basically everyone in the world is a Neanderthal.
Hope you enjoyed.