Who were the moundbuilders of the Ohio River valley?

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The Adena-Hopewell culture were the moundbuilders of the Ohio River valley, known for creating earthen mounds and their advanced artistic and technological skills. The Powhatan were a Native American tribe from the Virginia region, the Natchez were a Native American tribe from the southeastern United States, and the Choctaw were a Native American tribe from the southeastern United States who had a different cultural and geographic location than the moundbuilders of the Ohio River valley.

Who Were the Moundbuilders of the Ohio River Valley