U.S. trade with Canada and Mexico is back in Trump’s crosshairs with the tariff threat. …Much of the focus has centered on autos but Canada is also the top trading partner of the U.S. for critical chemicals, an industry now bracing for the potential impact. …Mineral firms in Canada are considered domestic sources under Title III of the Defense Production Act and have received U.S. federal funding for critical minerals projects in Canada. …Canada is also the largest supplier of U.S. energy imports, including crude oil, natural gas, and electricity. …Rand Ghayad, chief economist at the Association of American Railroads, said the interconnected rail network between the U.S. and Canada is a cornerstone of North American trade, underpinning economic growth and supply chain resilience. …The inflationary effects from tariffs will take some time to materialize, as these costs will need to be passed through to end buyers.