Why did the Umayyad Caliphate Collapse?

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#Why did the umayyad caliphate collapse #umayyad caliphate #abassid caliphate #history of the umayyads #Umayyad #battle of Zab River #Umayyad Caliphate #Arab Caliphate #Arab conquest of Spain #Arab siege of Constantinople #Abassid Revolution

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