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they were the language of their ancestors, and their economy of farming crops.</span>
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After Muhammad's death, the sunni wanted Abu Baker, Muhammad's closest advisor, to become the new leader of the muslim world, while the Shi'a favored Muhammad's cousin Ali. Abu Baker was made the leader of islam, but this left many bitter feelings and more disagreements arose between the two sides, especially many years later following Ali's assassination, eventually leading to the creation of two separate sects.
I believe it's colonial assemblies.
Hope this helps!
