The agricultural industry in California was modernizing, the grape pickers-among others-were being paid higher wages, some parts of the industry were being automated-and thus those workers were becoming redundant-and the necessity of relying upon an antiquated, manpower-reliant system of harvesting was become less pressing.
In other words, things were progressing as they normally should in a modern, post-industrial, Western nation.
The reversion to migrant farmers and illegal aliens paid minimal wages is hindering-not helping-U.S. agriculture.
And you are an agricultural expert how?
Sure, machines will replace human labor if practical. But the most cost-effective method will be employed.
There's nothing new about that.