Final answer:
The success of Islam's expansion under the Umayyad Caliphate was characterized by rapid conquests and establishment of Muslim rule over vast regions.
Explanation:
The success of the expansion of Islam during the Umayyad Caliphate was characterized by rapid territorial conquests and the establishment of Muslim rule over vast regions.
This expansion was facilitated by military victories, effective administration, and the adaptation of existing societal structures.
Notable conquests included the Middle East, North Africa, the Iberian Peninsula, and Persia, showcasing the Umayyad's significant influence during this period.
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