It’s not exactly architecture to dump a bunch of dirt into a pile. Cahokia has the possible purpose of staying high and dry during spring floods, but the Ohio Valley mounds are built in various animal shapes, among other things. The mounds around here were for burials, we’re told, but alas, no human remains are found in them, just pottery and whatnot. Could be that the remains just didn’t survive, but there’s not so much as a tooth, AFAIK.
The PreColumbian Americas were characterized by the same traits found throughout the world — populations boomed, populations busted, populations moved around, people killed one another.
There’s at least two distinct tribal groups in w Michigan, the better known crossed the Lake from what’s now Wisconsin sometime in the last 300 years or so. In the Upper Peninsula, an ‘indigenous’ tribe actually came from what is now upstate NY, relocating on the basis of a shaman’s vision, and when they got there, fighting the previous residents in a struggle known in their folklore as the Rice Wars (that’s the wild rice, not Asian rice).