Dude, there was a point when African americans werent allowed in certain places... those laws were revised. Is the same thing about migration. The laws have to be revised, and changed.
Want to learn something shocking? the US has the power to kick every single illegal Mexican [and immigrant, why did you just chose mexicans... there are thousands of latin americans, asian and european immigrants there too.] but they dont do it because they would lose shit loads of money.... do you think americans are going to do the dirty job immigrants do for the payment they get?
There was a 5 de mayo (around 2007 i believe) when every illegal immigrant refuse to work and to spend money on gas, for just that day (May 5th)... and only because of that, the US lost millions.
Fuck, freakin US got half of their country through illegal actions. And kick people out of their houses through the same measures.
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If they can't read or write in spanish, what makes them think they'll have a good like in the US where you need to know English?
You'll only end up in a worse situation.
You dont need to know english. I lived in the US 5 years, and knew several people who didnt speak english at all, and they still have a good life.