The Mound Builder story is actually an interesting story of it's own. This is because until recently, for hundreds of years archaeologists and historians alike made claims that the mounds of the Ohio and Mississippi Valley (and elsewhere) were made by some "lost civilization" and not the Native Americans that the first explorers and settlers met when they first were finding the mounds. Here is an actual page one from the "History of Waverly, New York" (Albertson) to see a reference to the Mound Builders and reference to them being the "lost race."
Anyway - the good news is that it is commonly accepted that the ancestors of the Native Indians now known as the "Shawnee," "Iroquois," "Cherokee," "Winnebagos" and others were some of the descendants of the people who once built mounds to facilitate their religious, political, and social structures and way of life.
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