“the Sahara was nearly impassable for thousands of years and isolated
the cultures that developed there until the introduction of Islam in the
Western coast”
This is nothing but a blatant and racist lie.
Blacks native Africans were mummifying their dead over five thousand years ago in the
Sahara Libya, and still live in all north African countries, and the rest of
the Sahara where they are the natives, like they did for thousands of
years ago. Eritrea, Sudan,Chad, Niger, Mali, Mauritania is in the Sahara. If racists want to limit Blacks to any part of the African continent, "Sub Saharan Africa" is not good enough. Moreover, Blacks
is the native to all parts of the African continent