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  He is faced with challenge of reasserting this alligance to Islam. 1st caliph
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  2nd caliph , he turned rads against Muslims
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  Umar takes over
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  Uthman takes over after Umar. 3rd caliph
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  Group of arab soliders who were unhappy of practice of favoritism captured Uthman.
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  4th caliph. 5 year call war known as "Fathima"- time of temptation
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  Assassinated for a struggle for power
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  this family set up a dynasty that ruled the Islamic world
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  muslim leader who captured Damascus
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  set up by Abu al-Abbas, this dynasty ended Arab dominance and helped make Islam a universal religion
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