the dust bowl to see where this is all going.
Yeah I know but thanks for the links. No question it will get bad, but it will be worse almost everywhere else in the world. The US has much more land compared to the population than it's rivals.
In the extreme you only need about 90000 km² arable land (~ size of Indiana) to grow enough potatoes to feed the entirety of the US (napkin math). The area of France could feed the entire world population. Today we have insane amount of "calorie waste" growing luxury foods like beef and almonds and chocolate and overfishing. So there is a lot of buffer for calories, even with soil degradation.
My point is this: Starvation won't be an existential threat to the US. Two oceans provide a lot of security, and options for geopolitical strategies. The only thing that can destroy the US is the US itself. Or nuclear war.
While conflicts and collapse of global trade could easily make starvation an existential threat or "threat multiplier" for Europe, India and China. And many other countries on their large and porous borders.