In the first 100 years of its existence, the main way of expansion and spread of Islam was:

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The main way of expansion and spread of Islam in its first 100 years was through war. Muslim armies conquered vast territories, including the Arabian Peninsula, Syria, Egypt, Persia, and North Africa. Through these conquests, Islam spread rapidly and established itself as a major world religion. While migration and revelation played a role in the early spread of Islam, they were not the main ways in which the religion expanded during this period. The Crusades, a series of wars between Muslims and Christians in the 11th-13th centuries, occurred after the first 100 years of Islam's existence.

In the First 100 Years of Its Existence, the Main