When William Lyon Mackenzie King entered Canadian politics, few could have predicted that this cautious, introspective man, who was guided as much by political instinct as by a curious, mystical inner life, would become the longest-serving prime minister in the nation’s history (Student Presentation: Cold War Canada slide 10). Though rarely charismatic, he possessed an uncanny ability to balance competing interests (Slide 11). Through this careful leadership, Canada emerged from the war not merely as a loyal dominion but as an increasingly confident “middle power,” known for diplomacy, cooperation, and a commitment to peace, which were foundations that continue to shape the country’s international identity today (Slide 12). Constitutional Autonomy and the Assertion of Diplomatic Independence A defining feature of King’s influence on interwar foreign policy was the way his self- perceived divine mission to promote world peace shaped his political judgment. As C. P. Stacey argues in The Divine Mission: Mackenzie King and Hitler, King’s combination of mysticism and patriotism helped elevate Canada’s relevance during the Second World War and guided his pursuit of constitutional and diplomatic autonomy for the country (p. 502). Cautious and attentive to Quebec’s sensitivities, King contributed to the war effort in measured but meaningful ways, enabling Canada to demonstrate its value internationally while maintaining unity at home. His people-pleasing, compromising approach enabled him to satisfy both Quebec and Britain by steadily supplying goods and services during the interwar period (slide 4, Student Presentation: Cold War Canada). As a result, Canadians emerged from the war with a stronger national identity, enhanced international capability, and increased economic and military capacity. Canada’s gradual assertion of independence in foreign affairs unfolded alongside and was reinforced by key constitutional milestones. The Halibut Treaty of 1923, negotiated directly between Canada and the United States without British involvement, marked the first significant assertion of independent treaty-making authority. 2 King used the momentum from this achievement at subsequent Imperial Conferences, particularly in 1926, where he supported the “equality of status” principle later articulated in the Balfour Declaration.3 These developments culminated in the Statute of Westminster (1931), which granted Canada full legal autonomy in foreign affairs. 4 Even so, King exercised this independence with deliberate caution, reflecting his conservative, Quebec-centered political instincts. These constitutional advances not only transformed Canada’s legal position in international relations but also helped cultivate an international perception of Canada as a self- governing state capable of articulating distinct diplomatic positions. This emerging identity formed the basis of Canada’s later role as a middle power, as one that relied on sufficient independence to engage effectively in multilateral cooperation and mediation.
