Why Did Cahokia, One of North America’s Largest Pre-Hispanic Cities, Collapse?

“That’s a Western mentality of resource exploitation—squeeze everything out of it that you can,” she explains. “[But] that’s not how it was in these Indigenous cultures.” -Caitlin Rankin

From studying coprastanol, from human poop, it sounds like the decline was slow, onto the 1500s.

If you find yourself near St Louis, it's well worth your time to visit Cahokia Mounds. It was the Original St Louis, after all. There's also 1 remaining mound on the Missouri side of the Mississippi.

Just don't ask the Cahokia Mounds people if Atlanteans built them.