A truck passes over the Peace Bridge between Canada and the United States, in Fort Erie, Ontario, on August 18, 2026.

A truck passes over the Peace Bridge between Canada and the United States, in Fort Erie, Ontario, on August 18, 2026.

For decades, the U.S. and Canadian auto supply chains have been tightly woven together. The trade war is threatening to unravel a complex system.

(Image credit: Cole Burston)