Are there jobs, like farm labor, where Americans are reluctant to work?
If so, how does that get logically and sensibly reconciled so that all get the food they want?
It can be done......
http://www.cis.org/FarmMechanization-ImmigrationAlternative
this article is from 2000....imagine the technological advances in robotics, "vision" type applications, etc. since then. Wish I were more of a tech guy, there's big bucks to be made by providing the technology to help growers transition from Mexicanized to mechanized.