Chinese food and agricultural imports in the US amount to $4.2 billion (2006). That's peanut compared to the overall US market.
http://www.opencrs.com/document/RL34080
The revenue of Archer-Daniels-Midland alone was 41.35B last year.
It's not like the US or anyone for that matter is going to starve if China stop exporting. China is barely self-sufficient for food.
I know you probably wouldn't notice that you pay $10/month more for food because of a devaluation of the dollar, but there are others who are more than a bit less immune to this. Fai de bèn a Bertrand, te lou rendra en cagant
