Which individual of the Bureau of American Ethnology proved beyond a doubt that the "Moundbuilder" mounds were in fact of Native American manufacture?

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Cyrus Thomas, a member of the Bureau of American Ethnology, conducted extensive surveys and excavations of mound sites in the late 19th century. Through his work, he was able to prove that the mounds previously attributed to a mysterious "Moundbuilder" civilization were actually constructed by various Native American groups.

Which Individual of the Bureau of American Ethnology Proved Beyond