Roughly $900 billion in annual trade between Canada and the United States, and, with it, traditionally chummy bilateral ties, is on the brink of upheaval, with President Donald Trump threatening to impose sweeping tariffs on Canada as early as this weekend.
Canadian Foreign Minister Mélanie Joly said Wednesday she is “cautiously optimistic” that a year-long diplomatic effort to stave off the levies could still yield results. But the U.S. president is "the ultimate decision-maker," she added, and can be unpredictable.
The fallout for Canada could be profound. Here is what to know.
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