What empire reunited the Arab Empire?

Answer 1

The Umayyad Caliphate initially played a significant role in uniting the Arab Empire after the death of Prophet Muhammad, expanding its territory across the Middle East, North Africa, and parts of Europe. However, it was the Abbasid Caliphate, which succeeded the Umayyads in the 8th century, that further consolidated and culturally enriched the Arab Empire, creating a golden age marked by advancements in science, culture, and trade. The Abbasids shifted the capital to Baghdad, which became a center of learning and commerce, helping to maintain unity among the diverse populations of the empire.