The author attempts to set out the case that can be made on behalf of the nation-state, in response to critics of the institution. The chapter first discusses what distinguishes nationality and national identity from other kinds of affiliations or allegiances. The author continues to set out the positive case for national self-determination and examines limits to national self-determination. Finally, he looks at cases where nation and state do not at present coincide and how the principles discussed earlier apply to the issue of secession.