How did Islam spread so quickly throughout parts of Asia, Africa, and Europe? Select the three correct answers. Responses Arab fighters were funded by a poll tax levied on Muslims. Arab fighters were funded by a poll tax levied on Muslims. Arabs remained united shortly after the death of Muhammad. Arabs remained united shortly after the death of Muhammad. Christians and Jews joined Muslim armies, strengthening their forces. Christians and Jews joined Muslim armies, strengthening their forces. Muslim fighters were a strong military force with effective commanders. Muslim fighters were a strong military force with effective commanders. Muslims conquered areas where the people previously had been oppressed. Muslims conquered areas where the people previously had been oppressed. The Byzantine and Sassanid Empires were militarily weak from years of fighting.