What reasons might there be for the timing, rapidity, and direction of Muslim territorial expansion?

Ughhh, I searched the chapter in the textbook, the chapter outline on the packet and google and I'm getting so stressed out, someone please help me?

3 answers

Muslim expansion occurred shortly after Mohammad's death. His followers were excited to pass the word along. In addition, religions weren't very well-established or organized in the regions in which the Muslims proselytized.
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