These jobs were done by Americans, Dane, with the help of seasonal guest workers from other countries, usually Mexico. The illegal aliens who are doing these jobs now, and other jobs, bring down wages for American workers because they work for less, you know that.
They have practically taken over the gardening industry, child care, restaurant work and construction work, always working for less than Americans can, pushing American workers out, because they work for less. A good example is the drywall industry in California. They have practically taken it over, and now they want a union, after cheating drywallers out of their jobs.
Americans have always done all these jobs, Dane, and illegal aliens bring down the pay scale for everyone, plus getting free medical care, free schooling for their children, and everything else free that their false documents allow.
Big price for cheap lettuce (which it's not anyway).
The price of lettuce hasn't changed much since the invasion began. The extra profits gleaned by mega-farms using chicano labor were put into aquisition of smaller farms and again pushing an American out of a job.
EBUCK