Answer:
Juan Thomas means when he says "the structure" is that the poor people are cheated from birth, but they made it through it. He is scared for Kino. It is important to the story because it foreshadows the things that happen to Kino.
Answer:
show that the wartime goals of the U.S. Cavalry and the Kiowas were fundamentally different.
Explanation:
The language in this sentence suggests that the author wants to "show that the wartime goals of the U.S. Cavalry and the Kiowas were fundamentally different."
For the Kiowas, they fought as a result of their expertise as good warriors. They fought out of their character and nature to fight and not because of the material gains they will get as a means of survival. Whereas, the U.S. Cavalry were somewhat different as they kept pushing forward even at a time when there is no war.