From Eras to Episodes: Isolationism as a Foreign-Policy Response in the United States and Beyond

The longstanding debate over U.S. isolationism has intensified amid recent foreign-policy choices, especially under Donald Trump’s presidency. Yet many contemporary invocations continue to use the term without explicit criteria for identifying isolationist policy, while more analytically developed accounts disagree over its domain, manifestations, and appropriate level of application. This article reviews these competing approaches and develops a revised conception of isolationism as an episode-based foreign-policy response. Grounded in observed policy steps, this conceptualization distinguishes isolationism from adjacent terms and related grand-strategy alternatives. It also treats actor-, administration-, and period-level characterizations as inferences from patterns across foreign-policy episodes rather than as fixed and largely abstract labels. The article then assesses the revised concept against Gerring’s criteria and illustrates its classificatory value through recent U.S. foreign-policy episodes. Although it does not eliminate all interpretive ambiguity, this behavior-centered conception improves definitional and domain clarity and differentiation, providing a stronger foundation for future comparative analysis of foreign-policy engagement and withdrawal.