Respuesta :
Between 500 and 1450, a rivalry developed between the Christian European states and "A. Muslim African and Asian states" although it was mostly the Muslim states, since this manifested itself in the Crusades.
I believe the answer is: A. Muslim African and Asian states
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The rivalry happened because of the will to spread their national religions to the rest of the world. Several wars occurs because of this rivalry, most notable the holy war that happened between the Crusades and the Ottoman empire from 1095 until 1291 CE