It is obvious in the letter that Hernan Cortes has a great desire to be the leader of the Aztec empire. The intended audience for the letter is the Emperor Charles V of the empire in hopes to persuade him that he is suitable to be leader. I would say the Aztec state is of great wealth from the way Cortes describes the advantages and beauty of environment leads me to this conclusion.
Particular characteristics of the Aztec religion that were mentioned in Cortes letter is the fact that human