Seems like a terribly irrational and inefficient way to run an economy but I'm sure russia will invade any day now. Or is it china these days?
In fact, we dump our cheap overproduced food on third world countries and collapse their ag. sector. If we stopped producing and switched to importing we would boost their economies.
Since food can be grown in almost any country on earth, we would have a diverse supply chain. I'm sure nothing would go wrong with this plan./s