What might those be?
corn wine and slicing each other to bits?
I doubt they invented corn wine the way they are alcoholics today.
The only group I'm certain that didn't invent slicing each other to bits are the niggers, so it is possible that can be attributed to them (feather indians).
A band my dad was in was playing a little tour that brought him to one of the Dakotas. This was like 15 years or so ago. Anyway, it was somewhere full of feather Indians. He said he never saw so many ugly, sickly looking people before (excluding niggers).