Ancient Illinois

In the 12th century AD, in what is now Illinois, there was a large city with pyramids:

Cahokians performed human sacrifice, as part of some kind of theatrical, community-wide ceremony, on a startlingly large scale unknown in North America above the valley of Mexico. Simultaneous burials of as many as 53 young women (quite possibly selected for their beauty) have been uncovered beneath Cahokia's mounds, and in some cases victims were evidently clubbed to death on the edge of a burial pit, and then fell into it. A few of them weren't dead yet when they went into the pit -- skeletons have been found with their phalanges, or finger bones, digging into the layer of sand beneath them.

Be wary of "simpler times".
Some held horrible crimes.