Answer:
The answer to the question: During the expansion of the islamic caliphates, Muslim rule was often preferred to Persian or Byzantine because:___, would be: because Muslims were more tolerant of religious differences than either the Persians and the Byzantines.
Step-by-step explanation:
Essentially, caliphates were states that formed under Muslim influence and rule and their name derives basically from the title that their leaders received, caliphas, as supposed political and religious heirs to the Prophet Muhammad. In history there have been three major caliphates which took place during the Medieval times: the Rashidun (632-661) the Umayyad (661 to 675) and the Abbasid Caliphate between 750 and 1258.
One reason why during the expansion of these caliphates Muslim control and influence was preferred over that of Persia and Byzantium was that Muslim rulers tended to be a bit more open than either of the others in religious matters and thus were more tolerant to differences inside their kingdoms.