Just because you don't understand it, doesn't make it untrue. I provided you with plenty of peer-reviewed papers. Do you believe in evolution? Genetics? If yes, then this is nothing but the logical progression. All you're doing here is jamming your fingers into your ears and screaming "LALALALA!!!". As for Rushton, he was probably referring to
consanguineous marriages. Inbreeding is a huge problem in Islamic countries.
Congo was an exception, not the rule. For example, South Africa has taken a turn for the worse since apartheid was ended (worse for blacks too). As for Ethiopia, it was occupied by the Italians, even if that was only very briefly.
I'm starting to think you're trolling. How can you accuse others of writing lazy posts, when what you post is incoherent, unsourced nonsense? Also, yes, there is a lot of diversity within the black race, so what? That doesn't contradict anything any of us have said here. I mean there is a great deal of genetic diversity between different amphibians. Does that mean they're not amphibians? Of course not, such a conclusion would be silly