But does America have a trade imbalance with Canada?

Yes, because Canada has a lot of cheap oil which America wants. If you deduct oil, the trade deficit runs the other way.

Yes! US agriculture (Mostly a red state industry) needs potash. Google AI says that most potash comes from (in order) Canada ("is the primary global exporter and supplies nearly 80% of U.S. imports"), Russia, Belarus, China, and "smaller volumes are supplied by countries [...]".

If I were king of Canada, I would restrict supplies of such materials needed by red states.

I'd say that the cultural links are so strong that any actual accounting for trade imbalance is just not worth thinking about.

Some things are bigger than money.

... which, come to think of it, is something that the current administration doesn't understand, at least from a "personal net worth" standpoint, and explains why this is happening to begin with.