4 Feb 2020 A brief guide to the trade deal between Canada, Mexico, and the US. trillion- dollar North American Free Trade Agreement (NAFTA). Country of origin rules: Automobiles must have 75 percent of their a 16-year sunset clause — meaning the terms of the agreement expire, or “sunset,” after 16 years. From NAFTA to USMCAFREE TRADE IN NORTH AMERICA TODAY & TOMORROW Certification of origin can be achieved using informal documentation, such as The terms of USMCA will remain in effect for a period of 16 years, at which Swiss origin, if they originate in the contracting party to which the finished goods are exported. Bilateral cumulation is provided for in all free trade agreements,