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Why do scholars divide Plains history into periods before and after the arrival of horses?

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Plains style — Indigenous peoples of the Great Plains Dancers at the Totah Festival Powwow performing the Northern Tradition dance, a dance inspired by Plains traditions, on September 1, 2007, in Farmington, New Mexico.

Scholars divide the history of the Great Plains into periods before and after the arrival of the horse because the animal’s introduction profoundly transformed the material life and productivity of Indigenous peoples in the region.1

Before the horse, hunting was a pedestrian activity. The arrival of horses—which became common on the Plains by 1750—greatly increased human mobility. This shift allowed mounted groups to effectively keep pace with large buffalo herds, enabling them to rely on these animals as a primary food source across the grasslands.12

By integrating horses with other technologies like guns, tribes were able to adjust their annual cycles to match the movements of the buffalo, leading to a more nomadic lifestyle that supported larger social gatherings during the summer months. Because this transition fundamentally altered how communities lived, worked, and interacted with their environment, it serves as a critical marker for understanding the development of Plains cultures.21