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the aztecs thought cortes was a messenger of their god
Hernan Cortes used the Aztec religious beliefs to his advantage by exploiting the prophecy of Quetzalcoatl's return, claiming to be the god returning, which helped him gain both allies and create fear among the Aztecs. This approach ultimately played a significant role in the downfall of Tenochtitlan as it caused divisions within the Aztec empire and weakened their resistance against the Spanish conquest.
Because of the Aztec's religious beliefs, when Cortes arrived in Mexico, the Aztecs believed that he was a god. The horses that the men rode and their much lighter skin coincided with a religious belief that they had and so, instead of trying to fight off Cortes and the Spaniards upon their arrival, the Aztecs treated them as gods; lavishing them with gifts and giving them food, gold and other supplies.