I think niggers are the progeny of Ham, the son of Noah (Japheth = Asians, Shem = whites). I read somewhere (sorry I don't remember where, it may have been the book of Jasher or the book of Jubilees or somewhere on the internet) that Ham found some writings about genetic modification tech that survived the flood, and he and his children defiled their bloodline with genetic experiments and interbreeding with apes. You'll have to do some digging if you want a more reliable source than me.