The Umayyads took over the empire by killing Ali's army and invading the empire.After the Umayyads took control of the region, they proposed that the whole territory should use one language (the Arabic) in day to day life in order to strengthen the unity of the empire by eliminating the invisible wall created by difference in tribes
Answer: Instead of using resources to support their lavish lifestyles, the Umayyads could have used it to centralize governmental control over conquered areas.