The mounds in the Ohio River Valley were built by a lost race known as the Moundbuilders.

Name: The mounds in the Ohio River Valley were built by a lost race known as the Moundbuilders.
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The mounds in the Ohio River Valley were built by Native American cultures, not a lost race. These cultures include the Adena, Hopewell, and Mississippian peoples, among others, who constructed these earthworks for various ceremonial, burial, and residential purposes over centuries.

The Mounds in the Ohio River Valley Were Built by a Lost