WI Mu'awiyah hadn't become Caliph?

What do you think would be the effects of Husayn ibn Ali becoming the 6th Caliph after Ali, instead of Mu'awiyah?
 
Depends on how it happens. Civil war against Muawiyah again?

In any case I think a regime headed by Husayn might shift the center of Islamic power towards Persia decades earlier since the Umayyad was first the Syrian Arabs. In that case it might be possible that Africa expansion is slowed. Maybe the Exarchate of Carthage survives somehow or becomes the western border of the caliphate.
 
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