>>17844969
A combination of things, Africans were already resistant to Old World Diseases and the continent has diseases which made colonizing the interior difficult, so there was no mass die off of native inhabitants meaning the population weren't as easy to displace as in the Americas. Malaria, Sleeping Sickness, the TseTse fly, and climates Europeans generally don't like to live in. The places with the most amount of Whites in the New World and elsewhere have either Temperate or Mediterranean climates similar to most of Europe.