Your first one is about slaves as economic consumers, not canibalism. Your second is about natives eating slaves in: New Zealand, New Guinea, the Congo, and China Your third is about a single ship and a single crew accused of doing so (not proven) and self-admittedly focuses not on determining the truth of the matter, but on the process knowledge was transmitted and understood given the communication limitations You have given 0 evidence for systematic cannibalism in the American South