Archaic indians who hunted the bison herds of the great plains were

The answer is - hunter-gatherers.

The Archaic Indians in North America were hunter-gatherers. They were reliant on hunting animals and gathering plants and their fruits and vegetables for survival. Still, in the early period until the landscape changed its appearance after the end of the ice age, they were mostly focused on hunting, and they were usually hunting the big game animals, including the bison, and also the mammoth, wild horses, giant sloth, before they went extinct. This was due to the living conditions in that period, and that the agriculture was still not taking place in their societies.

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