Via the WSJ comes the detail:
Automaking
The new three-country pact would require auto makers to build a greater portion of a car in North America and with higher-wage workers to avoid duties when a car crosses borders. That would be a relative win for Detroit’s Big Three auto makers, which rely heavily on factories in Canada and Mexico for the U.S. market and can now move forward with factory investments with greater clarity. Car makers from Europe and Asia with plants in Canada and Mexico would also get more clarity, but provisions about local components and export limits could complicate operations. The deal also would be a win for American auto workers and their labor unions.
