Reading the comments so far, I think many miss the point of the article :
If farmers are having to stop farming in OTHER countries, then that is a direct impact on the US food supply, because the US is a net importer of food ; it does not matter what US agricultural policies are for farms in the US.
The US is a net exporter of food. Last year, the US imported $163 Billion in agricultural commodities while it exported $172 Billion.