I've been reading Indigenous Continent by Pekka Hämäläinen recently, I picked it up now that it is available as a paperback. The history is fascinating and I highly recommend it with the note that I'm ~1/3 of the way through.
Early on in the book he describes the rise of Cahokia and other Mississippian societies in America as tied to the climate in the medieval warm period. And how during the Little Ice age the priestly class could not create good conditions for agriculture, which undermined their power at a time when crops were failing and hunting became a dominant food source.
Early on in the book he describes the rise of Cahokia and other Mississippian societies in America as tied to the climate in the medieval warm period. And how during the Little Ice age the priestly class could not create good conditions for agriculture, which undermined their power at a time when crops were failing and hunting became a dominant food source.