“All the people outside Africa are closer related to EACHOTHER”
We are all 100% related to ourselves, unless we are a chimera. ;)
All told however we are a very homologous species, reflecting our recent common ancestry. We are a very young species and very similar to each other despite the obvious difference in skin color to balance vitamin D production with filtering out mutagenic sunlight.
We are nearly identical to each other. That is due to coming from the tiny group of survivors of a worldwide catastrophe not so long ago. There simply hasn’t been time to drift into a lot of variety. Presumably there was no one left in Africa at all after that event, so the present occupants of Africa would have had to migrate back to Africa and might not resemble the original varieties at all.