從1988年(裏根時代)開始,加拿大和美國就簽訂了自由貿易協定/NAFTA。經過重新談判,2018年川普不僅續簽了美墨加三國新的自由貿易協定USMCA, 而且在簽字儀式上,川普亦自豪地宣布:“One of the most important deals, and the most important trade deal we’ve ever made by far.... I am thrilled to speak to the American people to share truly historic news for our nation, and, indeed for the world."***trumpwhitehouse.archives.gov/briefings-statements/remarks-president-trump-united-states-mexico-canada-agreement/