What accounts for the change in the way of life for the Lakota (Sioux) as they moved from a sedentary forest-dwelling people to nomadic hunters living on the Great Plains?

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The acquisition of horses from the Spanish in the 17th century allowed the Lakota (Sioux) to become skilled nomadic hunters and pursue buffalo herds on the Great Plains. This dramatically changed their way of life and economic sustenance.

What Accounts for the Change in the Way of Life