MrMoe makes a good point that America wouldn't be where it is without immigration.
Many times immigrants have "taken" jobs that were there all along but many Americans considered beneath their dignity apparently, because they went unfilled for a long time. Also, some industries (NOT just farming) are arguing for looser immigration rules because they need highly trained/skilled workers they can't find here. High-tech is probably the best example. Is it merely a coincidence that the vast majority of teens and college students here admit to personally cheating or holding a "who cares?" attitude about it when US student scores in math and science are so far behind the world's?
As far as Mexico...the way to stop immigration from there is to help their government fix their economy. Make it more profitable for the average citizen to stay there. If I can make in half a day what I can in Mexico for a full day, why should I stay there? And if I get caught? I can be deported (and try again) or go to jail (benefits before being repatriated home) (and try again).
Besides, many of the comments here make it sound like they're taking advantage of us. I'd like to know one race/nationality/ethnic group that hasn't been cheated, abused, treated unjustly, or in some other way screwed by the American Dream after coming here.
Every person wanting to come here is one more vote in favor of the idea that America is the place to be. If a person trades jobs for one with better pay and benefits do we say he's wrong? Then why should we say that for the person who trades countries?
It's easy to criticize someone leaving their homeland and not staying to fight their country's problems. But some of those problems aren't solvable by one person's sole efforts. Or they may not have the resources there. Or they may not be attracted to the idea of arrest, torture, and hard labor for two decades or death for speaking out. And what support they get from us, the mouthpeice for the oppressed! After all, after the Chinese ran over the Tianeman Square protestors in 1989, OUR PRESIDENT George the First went to China and (to my knowledge) didn't say a word about those killed or imprisoned. Yep, we believe in human rights all right.
Yeah Granny, Crystal...easy to say what you did here. Try it when one of your own family could turn you in to the secret police. Maybe you're not afraid of rubber hoses being used on your feet's soles, or being kept awake for a week straight, put in a 14" by 14" cell 24/7 so you can't sit for a week--you sleep leaning your knees against the stone wall, or having "salt water douches" as they're known forced down your throat again and again until you're racked with thirst...and these are the mild "entertainments"! I left off describing some of the more "stimulating" things they do to men and women in prisons.
I can cut some slack for someone afraid of that. Who's going to work with them? Who can they trust to talk about this with? If they get in a jam, will they sell you out to save their skin?
Pain just isn't me, or a lot of others living in the real world either.