do we still seriously doubt that anything besides flooding was the dominant factor?

well, first of all let's take a moment to reflect that almost nobody knows that st. louis was conquered and renamed rather than settled.

but, i think we have enough background now to realize that this is going to be a challenging region to settle, long term. floods. tornadoes. kind of makes migrating seem rational, huh?

i don't mean to trivialize what's happening in the delta. but, if you live there, you might want to get out before you drown. this is now a persistent problem that is not going to get better.

https://en.wikipedia.org/wiki/Cahokia