Final answer:
Islam spread quickly due to effective military strategies, trade routes and economic ties, and religious tolerance and political alliances.
Step-by-step explanation:
Islam spread quickly for several reasons. First, effective military strategies helped to expand the reach of Islam. Islamic armies, led by strong leaders, were able to conquer and establish Muslim rule in many regions.
Second, trade routes and economic ties played a significant role in the spread of Islam. Islamic merchants and traders traveled along trade routes, spreading the religion as they interacted with diverse cultures and societies.
Lastly, religious tolerance and political alliances also contributed to the rapid spread of Islam. Islamic rulers often allowed non-Muslims to practice their own faiths, which fostered a sense of unity and cooperation.