Answer: Like most civilizations throughout history, the Islamic way of life spread through military conquest. ... Islamic civilization also spread due to mission work. Once military conquest had established a caliphate or Islamic state, missionaries would mingle with local populations to propagate the teachings of Islam.
The military expansions of the earlier period spread Islam in name only; it was later that Islamic culture truly spread, with people converting to Islam in large numbers. This spread of Islamic culture was facilitated by trade, missionaries, and changes in the political structure of Islamic society.
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