What were the circumstances the led to the ‘Abbasid Revolution?

1.	What were the circumstances the led to the ‘Abbasid Revolution?
Answer» The Abbasid revolution also called movement of the man of the black raiment was the overthrow of the Umayyad caliphate (661-750CE) , the second of the four major caliphate in early islamic history,by the third the Abbasid caliphate (750-1517CE) .

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