This is the generally-assumed trajectory of Mayan civilization as well, and it’s just as hard (for…
Bill Morris

Well, there’s Detroit…

But historically the fall of a city might not have required an active diaspora out of it: from what I’ve read, no large cities were self-sustaining in population until the invention of modern medicine. So all it would take for a city to die out is for people to stop migrating to it long enough for the remaining residents to die of disease.

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