During the postclassical era, Islam expanded significantly across various regions, including the Middle East, North Africa, and Spain. Following the death of Prophet Muhammad, Muslim armies and traders facilitated the spread of Islam through conquests, trade routes, and cultural exchanges. This led to the establishment of Islamic empires, such as the Umayyad and Abbasid Caliphates, which played crucial roles in disseminating Islamic teachings and culture. As a result, Islam became a dominant religion in these areas, influencing their societies, economies, and political structures.