As chicanos became urban and rural wage workers, what problems did they confront? why was mexican labor so important? in which industries?

Mexicans were not accepted into unions, and they had to be content with the most difficult and poorly paid jobs. They were constantly replenishing the most disenfranchised group of American workers - seasonal agricultural workers who roamed the country. They were mainly recruited to collect long-fiber cotton in Arizona (which requires a lot of skills), to beet plantations and sugar mills in Colorado, Arkansas, and other states. Mexicans also worked on the building of railways.

Explanation:

either b) they were often feared and despised by other native cultures. or

c) their obsession allowed them to coexist with many other native cultures because of their peaceful nature.