Well frickin done!! I have been trying to keep up with the paradigm shift these last 40 years or so. There is much left to find and teach. One of the biggest ignorance-propagating factors is the Euro-christian 'young Earth ' paradigm. Even as recently as the '60s, it was pitted against plate tectonics and evolution.
My parents bought a farm in the 70s that had only been abandoned for about 40 years, that was in its heyday around 1900. The lost home foundations and overgrown fields that I had to re-open left a big impression on me about how short-sighted is the human sense of our world. From even before the Genome project, I was telling people that we were going to find out humans were much older and complicated than textbooks were saying.
I have taken my family to many of the mound sites from Ohio to Wisconsin and Iowa, (PS, Cahokia is technically in Illinois). My theory is that many were built to give kids something to do.
"Get outside and make a bear or something!" (re: Effigy mounds in Iowa and Lizard Mounds in Wisconsin).
Modern civilization (extraction based growth) teaches people to be useless to our places, but the apparent underlying function of terra preta and effigy mounds was to be generously engaged with places, especially the significant ones (rivers, fertile plains, grasslands, ).