My family did a bit of farming in the 70's
Most of our crops we could bring in with a rented harvester. However we started planting apples on part of the land, and of course you can't pick those quickly enough without help. My parents sold that farm a long time ago, but when I drive through there now, many of the stores are Spanish speaking. I don't see to many "Americans" wanting to do the farm work needed to feed us.
There is less immigration then before. They are having smaller families in Mexico, and the incomes are going up there. Many are starting to stay "home" now that they are getting better educations. In the future, who will be doing our farm labor?