FILE &#8212; Workers wait for the start of their shift at the Nissan auto plant in Aguascalientes, Mexico, on June 2, 2018. The U.S. and Mexico have reached agreement to revise key portions of the 24-year-old North American Free Trade Agreement and a preliminary deal could be announced on Monday, Aug. 27, 2018, a crucial step toward revamping a trade pact that has appeared on the brink of collapse during the past year of negotiations. (Meghan Dhaliwal/The New York Times)