That is fascinating, thanks for posting. A city of 20,000 in Kansas, unreal. Whipped the ass of the Spaniards, then, a century later, had vanished. Probably wiped out by disease.
European diseases really decimated the Indians.
I have visited the mounds at Cahokia, very impressive.
I have also spent a lot of time among the Maya ruins in the Yucatan, at Chichen Itza and Tulum.
You have to hand it to those Mexican Indians, who built pyramids of carved stone 200 feet high, when the apex of technology among US Indians was a dirt mound, a clay pot, and a flint arrowhead. Really makes me wonder about the Chariots of the Gods stuff, if UFOs visited the Maya and gave them a kick start.
