President-elect Donald Trump has announced plans to impose new tariffs on Canada and Mexico, potentially disrupting decades of North American economic integration. The proposed 25 percent tariffs could lead to increased prices for American consumers, particularly affecting the car manufacturing industry which relies on cross-border supply chains. Experts warn that such actions could undermine the credibility of U.S. trade agreements like USMCA, making future negotiations problematic. Critics urge Congress to act before Trump's inauguration to limit his trade authority and prevent a trade war.