Or a supply chain issue because a processing facility has to close cause all their workers were deported...

I know that your comment was sarcastic, but Canada supplies a whack of potatoes to the US annually. Nearly 2.5B in frozen French fries alone. There is a marginal potato trade the other way, nominally in processed products. Like Stonemill Kitchens amazing red potato salad, which I'm not allowed to fucking buy because its American and I'm craving the shit out of that stuff.

At the beginning of the year there was a donation of 4.000 tons of potatoes in Berlin. Apparently it was a redicously good harvest of potatoes and the price fell so much that it wasn't profitable to even sell them anymore.