I don’t comment a lot on your wonderful threads, but I read them and am appreciative of the pings!
I’ve only been to the Moundsville, WV museum once, and I have always wanted to go back and learn more about it...it’s the second largest (next to Cahokia...
http://moundville.ua.edu/moundville/
Looks nice! Thanks for the link. In this context, if Cahokia was built in 20 years, doesn’t it seem reasonable that other mounds were... ?