These communication difficulties occur at every scale, local regional and continental, making trade impracticible for all but the most valubable items. Thus ideas from other places as well as many scarce materials remained where they were.
Africa south of the Kongo but also including east africa in 2000 BC was made up of Khoisan speaking peoples. the linguistic group in the Kongo is not known by historians but probably was not Niger-Kordofanian/Bantu. The Sudan, Chad, and Niger were of the Nilo-Saharan language group. The Bantu existed only along a region in west africa from roughly Nigeria to Liberia.
By 1000 AD, however, the Khoisan group was reduces to mainly the Nama and Ikung peoples in southwest africa while the Bantu filled up west africa, the kongo, and bantu peoples like the Xhosa and Shona were in south africa.
so the point is, there was plenty of migrations and contact between all of sub-saharan africa...
and yes, i now realize that the philly public school system was probably exaggerating the glories of sub-saharan africa. nevertheless, it was more advanced than i think people here are thinking
thanks
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