I defend the cosmopolitan instrumentalist theory of secession, according to which a group has a right to secede only if this would promote cosmopolitan justice. I argue that the theory is preferable to other theories of secession because it is an entailment of cosmopolitanism, which is independently attractive, and because, unlike other theories of secession, it allows us to give the answers we want to give in cases like secession of the rich or secession that would make things worse for (...) minorities. I defend the view against the objections that it allows for colonialism and annexation, that it is not a distinct theory, and that it is impractical. (shrink)

In this paper, I consider the objection that unilateral secession by a national group (e.g., the Scots) from a legitimate, nonusurping state would wrong minority nationalities within the seceding territory. I show first that most proponents of this objection assume that the ground of the right to national self-determination is the protection of the group’s culture. I show that there are alternative justifications available. I then set out a version of this objection that does not rely on this claim; on (...) this objection, a national minority that seceded and created its own state would commit an expressive wrong against minorities within the territory over which it claimed jurisdiction. I show that this objection is undermotivated: only under a specific set of circumstances would the minorities of the secessionist region be subject to an expressive wrong. Finally, I show that the correct way to think about the claims of minorities in secessionist regions is in terms of a claim to secure access to equal civic status such that they are not at risk of becoming justifiably alienated from their new state. If a secessionist group cannot provide this guarantee to the minority residents of their territory, then their seceding would commit wrongful harm, and the presumption in favour of collective autonomy is defeated. I call this defeater the ‘Alienation Defeater.’With this in hand, we are now in a position to explain why nations are normatively special. Responding to the objections broached by Allen Buchanan and others, I show that even if other kinds of groups, such as religious groups, have the features in virtue of which nations have a claim to self-determination, this does not entail that those groups also have the right to secede. This is because an account of self-determination needs a list of ‘defeaters’—features in virtue of which a group’s claim to self-determination is defeated. I argue that religious groups are the strongest candidate for having a claim to collective autonomy in virtue of sharing many features with nations. I then argue that religious groups will run afoul of the Alienation Defeater; religious identity is too narrow to be the basis of the dominant collective identity of a state. This does not apply to nationality. This, I explain, is because of qualitative differences between religious groups, qua religious groups, and nations. (shrink)