Political Opportunity and Nested Institutions

Scholars use the concept of 'political opportunity structure' to explain how the political context affects the differential development and influence of ostensibly similar movements. Although the concept promises to become an important analytical tool for comparative studies, to date it is underspecified and undertheorized. It also faces new challenges in this era of increased transnational activism and more extensive scholarly recognition of activist ties across borders. In this paper I argue that assessing opportunity by looking exclusively at national political structures neglects the important role that international factors, such as alliances and transnational movements, play in constraining both states and their challengers. I begin by reviewing the literature on opportunity and drawing a synthesis between it and the literature on domestic influences of international politics. I argue that political institutions are nested in a larger international context, and that the tightness or looseness of that nesting affects the range of possible alliances and policy options available within states. I examine this framework by looking at New Zealand's decision in 1984 to prohibit port visits by nuclear-powered ships or ships that might be carrying nuclear weapons. I conclude by calling for more research that recognizes the interplay of national opportunities and international structures.