Discuss the spread of christianity and islam

Discuss the spread of Christianity and Islam. What reasons might there be for the timing, rapidity, and direction of Muslim territorial expansion? What were the causes of the decline of the caliphate? Explain the causes of the Crusades ans discuss their consequences in Europe and the Middle East. Argue whether or not the Crusades contributed to Europe’s economic recovery.
Please answer all questions fully and with reason.

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