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Systemic and Domestic Causes

Three systemic factors helped shift the course of hemispheric relations: the dramatic changes in the global balance of power produced by World War I, the failure of the post-war League of Nations system, and the growing ideological and strategic contests which produced the Cold War. First, World War I changed the global distribution of power in ways that undermined the logic for security-oriented interventions. Basically, it weakened the European powers significantly-which enhanced unipolarity within the Western Hemisphereand thus reduced the need to “preempt” European encroachments in Latin America via U.S. intervention.