Many Americans take a job based on the benefits offered besides pay. That's getting harder to do because of massive immigration with immigrants very willing to take less money and no health insurance benefits because the fully expect the taxpayers to provide that for them.
The immigrants have a choice to decline jobs that don't offer benefits, they don't want to suffer one iota for their poor choices.
Seriously, unmitigated business-interest driven immigration in the last 1800's and early 1900's to keep wages down is how we got unions to begin with. All you people who think the latest crop of immigrants is helping to 'bust the evil unions' need to ask yourself *why* it is that the AFL-CIO supports the amnesty and current immigration policies...?
I expect union membership to grow considerably in the next 5-10 years...only this go-round the members won't even be Americans...