U.S., Mexico, and Canada are headed for talks on the USMCA trade pact. Here’s what’s at stake

The Trump administration’s U.S.-Mexico-Canada Agreement replaced NAFTA and went into effect in 2020. Every day more than $4 billion worth of goods cross the United States’ borders with Canada and Mexico—U.S. auto parts headed for car factories in northern Mexico, cartons of Mexican avocados bound for California supermarkets, Canadian aluminum destined to become cans of Campbell Soup.Much of this bustling cross-border commerce is duty-free, thanks to the US-Mexico-Canada Agreement, or...