How about this- Americans are doing those jobs right now for the same wages, every day. Over 90% of those in the work force in American today- even in agriculture, construction, and service jobs are AMERICANS.
Americans will and are doing those jobs.
There may not be enough Americans to do all the jobs that need to be done, I honestly don't know the answer to that. No one will really know the answer until we get a grip on the illegal situation. If we need workers from other countries it is NOT because Americans won't do the work. Americans do hard, nasty jobs every day. To say otherwise is nothing more than an insult to those Americans who are doing those jobs right now.
How many U.S. citizens are picking strawberries 10 hours per day here in California? That's not an "insult" to anyone.