I think I read that some Indians in Florida were cannibals, and there is evidence of cannibalism in the ruins of the Anasazi Indians.
However it is thought that the Anasazi society disintigrated because they were infiltrated by Aztecs.
The Aztecs hunted many hundreds of miles away for their needed protein. The Anasazi had taken defensive measures (their famous lookout network for one) but eventually fell.
I'd say rather that the Anasazi infiltrated the digestive systems of the Aztecs.
There was a tribe of cannibals living on the Texas coast, Galveston Island, when the first settlers arrived. The correct spelling of their name escapes me now (not enough coffee) but it is pronounced Ka-ronk-a-was.