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The spread of Islam spans about 1,400 years. Muslim conquests following Muhammad's death led to the creation of the caliphates, occupying a vast geographical area; conversion to Islam was boosted by Arab Muslim forces conquering vast territories and building imperial structures over time.
The Arabs conquered Syria, Palestine, and Egypt from the Byzantine empire, while Iraq and Iran, the heart of the Sasanian empire, succumbed to their forces. Here in these lands, Islam fostered the development of a religious, political, and cultural commonwealth and the creation of a global empire.