Much of the problem is the competing political systems. While the US is of course, basically Capitalim, Canada tends to follow British Socialism.
The snag starts when much of an economy is based upon the "central planners" in Ottawa. For instance, Canadian milk producers are each allotted as to how much milk they could produce for market.
It is a natural impulse of farmers to have as productive a herd as possible, so a percentage of their milk produced, is handled the good, old Socialist central planners way. ....It's DUMPED! ...Millions of gallons per year!
The end result is that there is a very high tariff upon American produced milk & milk products, and Trump's feathers were ruffled by Canada's 250% tariff on American produced milk
...And milk was not alone, though it may have led the pack. To get around the current kerfuffle, I went back to very early 2025, before our newly elected president was doing basic cleanup, and was only beginning to consider tariffs.
https://www.farmprogress.com/farm-policy/the-real-story-behind-canada-s-250-dairy-tariffs in Socialism's government "managed economies", it is awkward to deal with capitalist nations, where cost of commodities fluctuate, and natural shortages or abundance move the markets and spur producers.
There is a vast difference between allowing the market to find it's own level or government dictating how much any one farmer can produce !
How would some bureaucrat in Ottawa know better how to manage a herd, than a farmer managing his herd out in Stone Mills or Peterborough ?
...Just more proof how inane socialism is.