Heer is one simple example:
Bauxite and cheap electricity are both required to make aluminium. Quebec has both in immense supply. The U.S. does not. It may have enough for its own domestic needs, but the U.S. makes aircraft, weapons and many products which it exports.
Despite the incessant complaints from the WH that the U.S. no longer manufactures anything, it is still the #2 manufacturing nation on the planet. This is why it cannot sustain large quantities of production without importing raw materials and energy products. And this need is what is going to increase the cost of many products made in the U.S.A. Importing aluminium, even with tariffs on it, will still be necessary.
If the persons in the White House had any brains, he would have carved out certain raw materials and energy products from his overreaching (and possibly illegal) tariff war. Instead, he shot the U.S. in the foot.