On top of the substantive issues, Trump went out of his way to criticize the Canadian negotiating team in the final days of deliberations, which Trudeau can play up as a sign of just how hard his staff fought on this deal.

Labor unions:

This agreement stipulates that at least 30 percent of cars (rising to 40 percent by 2023) must be made by workers earning $16 an hour, about three times the typical manufacturing wage in Mexico now. USMCA also stipulates that Mexico must make it easier for workers to form unions. The AFL-CIO is cautiously optimistic that this truly is a better deal for U.S. and Canadian workers in terms of keeping jobs from going to lower-paying Mexico or to Asia, although labor is looking carefully at how the new rules will be enforced. It’s possible this could accelerate automation, but that would take time.

U.S. dairy farmers:

They regain some access to the Canadian market, especially for what is known as “Class 7” milk products such as milk powder and milk proteins. The United States used to sell a lot of Class 7 products to Canada, but that changed in recent years when Canada started heavily regulating this new class.