I think this article misses a few more salient facts. 
US mid-west farmers are living a boom in exports of soya beans and corn to.....CHINA....
Farmers were aghast when Trump wanted to end China trade. 
Subsidies already destroyed the Mexican corn farmer; that's from whence those illegals come.
During one election phase, Paul Ryan, (R),(brought up a bill to thwart outsourcing of manufacturing (which had gone to China), he aced off against Beohner (speaker and fellow republican), whose riding represented farmers. So, it gets complicated.
Ryan's Bill never got anywhere.