This article examines Canada-US relations through their shared membership in a pluralistic security community (PSC). While the bilateral relationship has been turbulent for decades, the Trump presidency has damaged the Canada-US PSC by (1) exacerbating a decades-long trend of weakened shared identity and mutual trust between Canadians and Americans, and (2) undermining the democratic norms and institutions that uphold American domestic stability and Canadians’ expectations of peaceful change. Assessing the combined implications of the decline in shared identity, mutual trust and democratic stability, I argue that the Canada-US PSC cannot endure if the United States does not also consider Canada's national and security interests or if the United States itself poses a threat to those interests. Given current trends, the future absence of war in North America may reflect American domination over a weaker and dependent Canada rather than their continued membership in a bilateral PSC.

Contending rationales of peace and conflict coexist between countries and within regional spaces as conditions that motivate or constrain militarized behaviors. While the idea of balancing is still a relevant concept to understand contemporary security in South America, the region produces patterns of a nascent security community. This article argues that the regional repertoire of foreign and security policy practices draws on a hybrid security governance mechanism. The novelty brought by the cumulative interaction among South American countries is that the coexistence turns into a hybrid between both practices and discourses. To explain how hybrid formations are produced, this study analyzes the most empirically intense and academically controversial political and security interactions from interstate relations in the two security complexes in the region, the Southern Cone and the Northern Andes.