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Movement-countermovement interaction is an ongoing feature of contemporary social movements and, indeed, of contemporary politics. Yet the interplay of contending movements is understudied and undertheorized. This article begins to remedy this deficit by arguing that new work on political opportunity structure provides important insights and significant theoretical leverage for this study. Through a review of the literatures on countermovements and political opportunity, this article argues that this interaction increases when states enable but do not satisfy challengers. This article presents a general framework of theoretical propositions for understanding the interplay of movements and their opponents to animate and guide subsequent research.