Why do you think de vaca called for better treatment of
native americans after having been held prisoner by them

I don't know who De Vaca is but by context clues I would infer that he realized that Native Americans where not the savages they where thought to be.

This question is an opinionated one, and we don’t know anything about the module or anything, thus we can not answer it. but if you are having trouble on what it is asking basically it is just asking to (using your knowledge on the topic) say which topics you were most interested and which were the most challenging.hope this : p