I was under the impression that they were unsure of why the society declined and disappeared. I was more under the impression that it may have been do to climatic factors.
I was always curious about what great new ideas came into Cahokia and central US around 500 B.C. Their art looks very Aztec.
The following might have a connection to Cahokia...
Megadraught and Megadeath in 16th Century Mexico (Hemorrhagic Fever)
We know that DeSoto found a thriving civilization in the Southeast and the Mississippi Valley in the early 16th century. But when later explorers returned to the area, just a generation or two later, the large settlements he reported had ceased to exist.
It also seems to be established that the Mississippians had a cultural contact and conducted extensive trade with the Aztecs and other Central American tribes.
Similarly the Pueblo cultures of the Southwest also had extensive contacts with Central America -- though, apparently, very little with the Mississippian culture.
Amazing that there is so much we don't know -- and are only now discovering -- about the history of our own continent.
Thanks. I thought of this connection/possibility when I read this article this morning. We have much to learn.
I believe the Aztecs ate the Anasazi.