The U.S. government tried to get rid of immigrants before and replace them with American high school student athletes and most of them quit https://www.kvpr.org/2018-08-23/when-the-u-s-government-tried-to-replace-migrant-farmworkers-with-high-schoolers
Great idea from Soviet Union. Just ask them, how this turned out.
Pretty sure the quota system and the complete govt disregard for ag-science was to blame, and not the Labor force for that one.
You are right. The government disregard for anything contributed largely for the demise of the union.
However, I am fortunate enough to never experience this, but my parents had to participate in kolkhozes and it was terrible.
I guess, what I am trying to say is, MAGA would not appreciate such an agricultural system.