There are two main branches of Islam: Sunni and Shi'a. Sunni Islam is by far the largest group, although in some countries it is a minority. Sunnis have their historical roots in the majority group who followed Abu Bakr, an effective leader, as the successor of Muhammad, instead of his cousin and son-in-law Ali. Shi'ites are those who followed Ali, the closest relative of Muhammad, as Muhammad's successor.
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