>>716347053
Even with the cities going to shit, you still have the "But what do they eat?"
This is all just jungles. These guys lived among sprawling fields. So much so the ones who didn't level everything within sight distance actually called themselvs "Forest people" (K'iche' and even still the Spaniards did remark how much corn there was in their kingdom so it wasn't some pristine jungle, either).
Something like Japan, where you had a tropical civilisation living in small villages and every single bit of flat land around it was used for fields.
Old Kanto was just endless rice-fields and Mesoamerica, while not quite as pop-dense as Edo period Japan, absolutely needed a ton of cleared fields to supply their population.