According to Rubenstein at ESR Research Economic Consultants, Immigration is stunting innovation in the U.S. Other countries, such as Japan, robotize menial tasks and have no need for an underclass to which lower wages are paid. They are particularly inventive, not because they are smarter, but because of "economic necessity." There's no such thing as "jobs Japanese won't do."
Read the report with a plethora of links to other articles, books, tables, and reports, as would be expected from an economic consultant.
Check out this report on robots. There's a really neat page on a robot lawnmower.
I wasn't aware that two workers and machinecould reduce labor tenfold. Wait, could it be that we stopped finacing of research into farming technology in 1979 because during President Carter's term because his Agriculture Secretary, Bob Bergland, "didn't want to replace an adequae and willing work force with machines." Wasn't this about the same time we started hearing about how Americans wouldn't take those jobs anyway?
Would it have been better if investment had been made in Mexico to better their lives rather than to import their poverty and create the invasive immigration quagmire in which we find ourselves, perhaps through the law of unintended consequences...or not?