Much of what is taught about pre-Columbian native America is crap. It was a stone age world immersed in brutal Darwinian societies that were constantly at war with each other.
Precisely so.
It was worse in Australia.
There, they were constantly at war with one another, but did not have agriculture, domestic animals (arguably, even their dogs were not domesticated, just camp followers), pottery,the bow, cloth, or any metal.
Not surprisingly, there was plenty of cannibalism. I think cannibalism was less prevalent in the Americas. It is very hard to measure. It was prevalent in Central and South America.