I didn't give you links, I gave you names. Both bodies of work are more extensive than my preference to type.
By the late 1870s, however, scholarly research led by Cyrus Thomas (1825–1910) of the Smithsonian Institution and Frederick Ward Putnam (1839–1915) of the Peabody Museum reported conclusive evidence that there was no physical difference between the people buried in the mounds and modern Native Americans. Subsequent DNA research has proven that time and again. Scholars then and today recognized that the ancestors of modern Native Americans were responsible for all of the prehistoric mound constructions in North America.
Not only is my comment not speculation, I cited two amazingly extensive sources that I've spent weeks learning from.
Your ignorant comment moments later speaks poorly of your willingness to learn.
I didn't give you links, I gave you names. Both bodies of work are more extensive than my preference to type.
https://www.thoughtco.com/moundbuilder-myth-history-and-death-171536
What you said was wrong, and rather than trying to learn, you chose to stay wrong.
https://www.edgarcayce.org/the-readings/ancient-mysteries/ancient-dna-research/