Tariffs Tariff Negotiations USMCA Economic Impact Economic Policies Economic Cooperation NAFTA/USMCA Tariff Responses Retaliatory Tariffs NAFTA Tariff Implications Tariff Impacts NAFTA Replacement Economic Clout Diplomatic Responses Tariff Effects Border Policies Border Issues Fentanyl Issue Investor Confidence Chinese Investments North American Integration Immigration Policy Manufacturing Shifts Agricultural Inspections Immigration Automotive Trade Tariff Policies Protectionism Economic Sanctions