No, but there is evidence that immigrants work harder. Simply because they are hungrier.
Not so. First, "Immigrants" are something all together different then "Illegal immigrants" I agree that "Immigrants" are good to awesome workers because they invested a great deal of time and effort getting here and are determined to make it work. "illegal immigrants" get here by breaking the law, usually with a bale of dope on there back, or stuffed in the trailer of a truck or trunk of a car because due to there criminal history, or lack of a marketable skill they would never get in legally. They are the ones who will get food stamps, bring the quality and cost of labor down, shoot up states crime stats and basically become a drain on the system. So, "immigrants" are in a way hungrier, and I would say driven, and a benefit to our society. "Illegal immigrants" are not much more then dead weight.