What were the difficulties Mexicans faced in the U. S.?

The main issue is still occurring today and so it was mainly getting jobs to provide for their families, themselves, and their families back in mexico, so since Mexicans were illegal immigrants (aliens), they couldn't get jobs easily as us, they had to go through a lot of work and become a legal citizen to get a job, and even today Mexicans still have hard times working since the U. S. is not accepting as many immigrants anymore.