This chapter examines three additional cases: the Basque Country, Puerto Rico, and Québec. The objective behind these supplemental case studies is twofold. First, for the Basque Country, the goal is to understand why there has not been a strengthening of secessionism like in Catalonia. The chapter explains that Basque nationalism is exceptional for its history of political violence, which renders extremely difficult the type of alliance between nationalist forces that has occurred in Catalonia. Next, the chapter looks at Puerto Rico and Québec to assess how a focus on the nature of autonomy to explain the strength of secessionism travels beyond Western Europe. The case of Puerto Rico, where secessionism has always been marginal, helps to tease out the potential importance of perceptions on autonomy. Although Puerto Rican autonomy has not been adjusted, political debates over the constitutional future of the island, namely through multiple referendums on status, have likely fed perceptions that Puerto Ricans can change their autonomy, either through an enhancement of the current status or by becoming a state of the American federation. In Québec, the weakening of secessionism in the last decades has corresponded with a switch from constitutional reform to intergovernmental agreements as instruments for managing the position of the province within the federation. Constitutional change is difficult in Canada; consequently, Québec’s autonomy has been static constitutionally. As a result, when the focus for managing autonomy is placed on constitutional negotiations, secessionism in the province strengthens. When autonomy is managed through intergovernmental agreements, secessionism weakens.