So many things in your own article that you don't even have the capacity to notice, let alone understand.
So in other words, we used to feed ourselves. Communities were viable, millions more people were employed. Rather than a farmer's family moving away and piling into the competition for jobs in the cities, people made a living staying put. Amazingly, people ATE food and last I checked, the nation didn't stave and the economy didn't collapse based on Americans farming for themselves, not Big Agra and their cabal of illegal bullshit.
So the other 47% of hired farmers are Americans. OBVIOUSLY the take-away from this is that Construction, Production, Services, Transportation and hell, the overall workforce just isn't helping the economy survive the way Big Ag is by being so heavily skewed to illegal labor. How can we possibly survive until we allow cheating industries to "Jobs Americans Won't do!" all these other sectors as well?
So basically MOST of this bullshit has taken place since the '87 Amnesty. CLEARLY before this, Americans were unable to feed themselves. There must have been no such thing as a working economy.
What we need to do OF COURSE -according to your dumb ilk- is even more Amnesty so we can get these numbers off the charts, not only in the named industries, but ALL industries. Who the hell needs laws governing labor?
A dipshit like yourself of the future will someday be posting charts showing US Construction, Production, etc as 55% illegal, will insist there's no other way, will wring his stupid hands that the fat cats have a 'labor shortage' and can't find enough people willing to toil for long hours for shit wages , and will be -like a lot of your ilk- 100% ignorant of there ever being a time when this wasn't the case, that it ISN'T actually good for the economy, it's not any kind of viable norm, and it's nothing that people in a first world country should allow assholes to do to their industries.