Considering that the in-depth studies of pre-Columbian ruins in the Americas show that cities were abandoned from the gitgo-and many don’t show any signs of being burned and pillaged. There were droughts, floods and other natural disasters then as now-and when too many people were crowded into cities, something like that would certainly have resulted in lack of food, water and sanitation, producing disease, violence and death.
I would imagine the smart people grabbed some of their belongings and decamped with haste at the first sign of diminishing natural resources like food and water, since standing around and howling help me government, help wouldn’t have done any good.
The only reason people can live in anthills and beehives now is because necessities trucked and flown in allow that-but I don’t see it as healthy or really safe-a part of the grid going down in a natural disaster or attack would be a bigger catastrophe today-too many people don’t know how to live outside of the herd.
Considering that the documentary evidence left behind by the literate Mayans shows that they were bloodthirsty killers engaged in internecine wars, and like the Aztecs and at least one group in the Four Corners area practiced cannibalism, and that the tribal tales in North America that have preserved accounts of genocidal and near-genocidal wars, your post is mystifying.