When I was in the service I had a friend who was an American with deep Mexican roots. He told me how he and his family would pick crops to make extra money. Kids these days will not show up if they might get a blister or if the job doesn't offer leisure brakes and a wage above minimum. I remember when you had to be in the "in" crowd to get a job at McDonalds.
My dad is in late 70’s and farmed his entire life. Up until about twenty years ago...you could always hire some local guys for a couple of days (hauling hay or manual labor)...cash on the spot for eight hours of work. Then, it started to get more difficult. Most farmers today have the various apparatus gear to attach to their tractor and load round-bales of hay, and unload pallets from delivery vehicles. The idea of working eight hours and picking up $75 in cash is practically gone now.
I couldn’t even find snow shovels for kids this past winter; a co-worker cynically noted that they probably don’t make them anymore.
Americans will do any kind of work; they’re entitiled to negotiate wages like anyone else without illegal aliens tilting the playing field against them.