... position of partial isolation.It was more isolated than Eurasian fringes like Scandinavia or South-East Asia,which gradually adopted Eurasian cultures. But it was less isolated than theAmericas, ... broad Saharan region at least as early as Afroasiatic. Nilo-Saharan maybe distantly related to the fourth family, the Niger-Congo languages, which arespoken predominantly by Negroid peoples and ... unaffected by the iron-using tech-nology, domestic animals, disease patterns, trading relationships, religions, andalphabetic literacy that sub-Saharan Africa partially shared with the Eurasiancore.Partial...