Early American explorers did not believe that the edifices found in the Mississippi and Ohio river valleys could have been built by which group of native peoples?

Question

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The Moundbuilders were the group of native peoples who built the edifices in the Mississippi and Ohio river valleys, but early American explorers did not believe these indigenous peoples were capable of such architectural feats, attributing the constructions to other civilizations instead.

Early American Explorers Did Not Believe That the Edifices Found