Mystery Illinois Native Civ Uncovered

https://www.dailymail.co.uk/sciencetech/article-13624273/Cahokia-tribe-clues-vanished.html

The Cahokia people once thrived in what is now Illinois, only
to abandon their six-square-mile city more than 600 years ago.

While the leading theory has been that the ancient city had
become unlivable after massive crop failure that followed
an epic drought, a new study has discovered evidence pointing
toward another explanation.

Carbon-dating analysis of deep-cut layers of soil and
agricultural remnants, the researcher said, now show that
farming practices remained consistent in Cahokia even
amid those punishing drought years.

. . .

   Oh no - CLIMATE CHANGE !!! Those damned SUVs !!!

   These people were not up to Mayan or Aztec standards
   but they seemed "on their way", much like the Cherokee.

   At least they self-dissipated, while the Cherokee
   had dissolution imposed on them by the euro settlers
   who couldn't STAND the idea of a well-advanced native
   population.