Summary and Keywords
Diffusion with respect to international politics is commonly defined as the tendency for events or behaviors occurring in one spatial unit to influence the likelihood of similar events or behaviors occurring in another spatial unit. General definitions and mechanisms of diffusion that can be thought of as somewhat ubiquitous to the broader literature of diffusion in international politics tend to focus on processes of spillover or learning/emulation. These processes are common to the adoption and diffusion of policy innovations, the spread of democracy and democratic revolutions, and the contagion of civil and international conflicts. While the nomenclatures of these literatures often differ quite significantly, considerable overlap exists in terms of the primary conceptualizations of diffusion mechanisms. Most literatures appear to identify some combination of the following mechanisms: coercion and external pressure; constructivist norm cycles; social networks and linkages; geographic proximity and demonstration effects; learning and emulation. While the study of these phenomena and mechanisms has advanced significantly in recent years, some notable areas of future growth remain. First, differentiating between learning/emulation and spillover processes still presents considerable difficulty. Second, the role of “firewalls” in limiting diffusion processes is not well understood in either general or specific cases. Third, while understanding of social and geographic spaces is now rather nuanced, it remains unclear how best to theorize and model timing in diffusion processes.
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