Answer:
Explanation:
Because Americans felt they were a better society and people than other groups of people (Mexicans/Native Americans) already living out West and somehow that justified them taking over the West. The Mexican government grew frustrated with them moving their illegally.
i cant speak for those people but i can tell you what i know. when the stock market dropped and everyones money was lost by the bank their view towards their country turned for the worst they thought that they have been robbed by the government, they stopped trusting other people even the people the closest to them so their view was changed by more then money it was about trust, trust in their country and their friends... hope that helped