Comment by grayhatter

Good question.

No, I would not prefer that. A robust distributed system is less likely to crumble under local pressures. A blight could more easily sweep through a single nation and take out a staple crop or two, where it'd be impossible for that to happen globally. You can't spin up additional global trade quickly after you've shut it down, which could lead to people starving in America. I like systems that can't fail. That's especially true when that system is how I'm able to eat food.

Global trade isn't a security issue, national or otherwise. We don't increase safety or stability by reducing sources of consumables.

Edit; super timely example because this isn't an unlikely hypothetical: egg availability due to bird flu.