-Alliances with other tribes helped the Spanish, Malintzin, an Indian woman helped Cortez
-She helped him with others who did not want to pay trribute
-better weapons, guns, also helped
-Spanish also brought horses, which the Aztec had never seen before
-Geography was awful, the spanish blocked causeways, this cut off any drinking water
-thousands starved
-Spanish eventually brought smallpox
-Aztec died from disease and Spanish declaring war upon them

Causes of the great defeat of the Aztec