Two reason why cortez was able to conquer the Aztecs?

A.#1. The Aztec people mistook Cotes' arrival as the return of their god Quetzalcoatl, who was said to have left on a raft of woven snakes, who is described to be of fair skin and wore a beard unlike his people. Strangely similar to the Spanish who arrived on a huge "raft" or ship, wore beards,shiny armor, and rode horses. A.#2.After the war the Aztecs had no chance of also surviving biological warfare.The small pox the Spanish left behind finished off 80% of the population during the next ten years.