I do no know how granger got into this but it illustrates what depths one will descend to in order to prevaricate, obfuscate and perform all sorts of mental gymnastics to deny the obvious because it contradicts his prejudices.
No one makes a claim as to where rice was first cultivated. One asserts that rice, a rather particular kind of rice, was native to Africa for over 3000 years. The idea of mass cultivation across much of Africa means domestication of the specie was pervasive.
Lets chalk this up to another schooling that you got for free from me, pro bono. You ran along with the other on the erroneous assumption that every single crop originated from blacks and africa. Now take your schooling and thank druggie for another successful class.