牛津经济研究院：2026年USMCA下美加关税升级的经济影响报告（英文版）

The United States and Canada share one of the most economically integrated bilateral relationships in the world, built over four decades of free trade. This relationship is now under significant stress as the July 1, 2026, deadline to extend the United States-MexicoCanada Agreement (USMCA) has passed without renewal, triggering a period of annual reviews and sustained uncertainty for businesses and investors on both sides of the border.