It was long ago I concluded that our citizen's rights extend only as far as somebody's right to make a buck. As soon as they interfere with the entrepreneur's right to exploit workers and customers for the greatest profit, those rights are a joke. And as you've said well, it's the U.S. employers who make use of illegal labor that are the source of the problem. But this has become a nation of the money, by the money and for the money, so our "leaders" in Washington won't be disciplining the employers responsible any time soon that I can imagine.
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