Cyrus Thomas, an archaeologist employed by the Smithsonian Institution, demonstrated in the 1890s that the effigy mounds, burial mounds, and temple mounds of the Northeast and Southeast United States were built by Native Americans, not by a separate 'Mound Builder' civilization.
Sources
- Native American - Prehistory, Tribes, Culture | Britannica (britannica.com)
- https://www.ebsco.com/research-starters/anthropology/mounds-and-mound-builders (ebsco.com)
- https://www.americanheritage.com/mound-country (americanheritage.com)
- https://www.laphamsquarterly.org/contributors/cyrus-thomas (laphamsquarterly.org)
- https://academic.oup.com/whq/article-abstract/52/4/459/6335895 (academic.oup.com)
- https://repository.si.edu/handle/10088/91661 (repository.si.edu)
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