The principal aim of Chapter 9, which focuses on US trade relations with Canada, is to present case studies in the domestic diplomacy of trade agreements. Despite the commercial significance of the US-Canada FTA, which set the terms for the world’s largest bilateral trade relationship, members of Congress were more interested in the agreement’s extrinsic value ― the leverage it gave them for negotiations with the president ― than in the intrinsic value of the agreement itself. They took full advantage of the opportunities that this agreement presented in order to pry larger changes in US policy on the reciprocity and trade-remedy laws. That same process was less in evidence when Congress debated the NAFTA agreement, when the intrinsic importance of trade (and related issues) with Mexico were of much higher importance, but that episode saw a repeat of many of the themes experienced in the earlier debate.