It's happened before.

Submitted by Alan Rosenthal (Israel), Mar 3, 2007 at 14:05

"No large territory has ever shifted from one civilization to another by virtue of a collapsed population, faith, and identity"

How about when the Roman Empire went Christian? How about when most of the Eastern Roman Empire + all of the Sassanid Empire went Moslem?

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Daniel Pipes replies:

The Roman Empire did not shift from one civilization to another.

The Eastern Roman Empire and the Sassanid Empire fell to the Arab armies.