When a diffusion comes along it usually causes diversity between the people who diffused it.
example:
john : i hate this culture!
jane : shut ur mouth !
john : this needs diversity !
A possible reason was the attacks on them by crusaders and mongols around the 11th and 12th centuries. Another reason could have been the Arab rulers removing taxes from non Muslims and doing other things that hurt there income.
Answer:
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The fall of the twin towers and the death of million
