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Canada doesn’t need tariffs. It needs an export tax. Here’s what the US actually cannot replace on short notice: Potash. Canada supplies 85-88% of what American farmers put on their fields. Russia, the next largest source, covers maybe 9% of that gap. Squeeze this and it’s not a trade story, it’s a farm input cost story, felt at the grocery store within a season. Uranium. Canada supplied 33% of the uranium that fueled US reactors in 2024, more than any other country on earth. The US is trying to expand nuclear right now to keep up with AI power demand. There is no faster way to sabotage that plan than choking the fuel supply. Crude oil. Canada is over 60% of US crude oil imports, up from 41% a decade ago. Midwest refineries are built specifically to run heavy Canadian crude. You don’t just redirect that to Saudi light sweet overnight. Gas prices would feel it fast. Nickel. Canada provides roughly half of US nickel needs. America has exactly one operating nickel mine. One. Softwood lumber. About 74% of US softwood lumber imports are Canadian. Homebuilders are already choking on tariffs pushing housing costs up. Cut the supply and you make the affordability crisis worse, guaranteed. Electricity. Ontario and Quebec feed power straight into the US grid. Border states don’t have a backup plan for that capacity sitting in a drawer somewhere. None of this is about hurting Americans for spite. It’s about pointing out that the “just tariff Canada” strategy assumes Canada has no leverage. That’s false. These are inputs the US cannot substitute in months, some of them not for years. An export tax on any of these turns the pain asymmetric fast, and Washington knows it, which is exactly why potash and uranium got added to the US critical minerals list once this became obvious. Trade wars run on the assumption the other side has no cards. Canada has cards. It’s just never been willing to actually play them.