Conversation so far:
what was the importance of the Bison to them?
The Niitsitapi main source of food on the plains was the American bison (buffalo), the.
how did they hunt them?
The hunters would round up the buffalo into V-shaped pens, and drive them over a cliff (they hunted pronghorn antelopes in the same way).
why would they drive them over the cliff?
CANNOTANSWER.

Question: what would they do after they had driven them off the cliff?
Self-contained rewrite: what would the Blackfoot Confederacy do after they had driven buffalo off the cliff?