AgNoStiC MuSliM
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If the culture shifted, may I ask what happened to the people? How did they go from large cities to no evidence of settled life?
I have mentioned this before was well, that a similar abandonment of cities occurred in the Mayan civilization that was also equally inexplicable.
The theories were that large cities acted as magnets for invasion and burgeoning populations in a small areas placed severe strains on easily available local resources, eventually resulting in a collapse of these cities as people migrated back into the surrounding countryside in smaller groups.
Not sure why similar arguments woudl not apply here - they are a lot less dramatic than these 'enormous natural calamity' explanations, though not as 'exciting'.
Cultural similarities are easily explained through natural human migratory behaviour.
Again, all of this is a sort of mundane and simple picture of a an evolving region, and not as fanciful and earth shattering as explanations of massive disasters, but it does not have to be the latter case - simple explanations work too.