It's impossible to predict exactly what would have happened if the South had won the Civil War, but it's unlikely that the Plains Indians would have remained completely free. The Confederacy was still a slaveholding society, and their economy relied heavily on cotton production. It's possible that they would have expanded westward and come into conflict with the Plains Indians over land and resources.

Furthermore, the idea that the Confederacy and Native American tribes would have coexisted peacefully is unrealistic. While some Native American tribes did fight on the side of the Confederacy, it's important to remember that many tribes had already been forcibly removed from their ancestral lands and placed onto reservations by the U.S. government. The Confederacy may have seen Native Americans as potential allies, but they were still operating within a framework of colonization and imperialism.
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