Nationalism, Self-Determination, and Political Boundaries

Core Idea

Self-determination—the right of peoples to govern themselves—raises questions about nation-states and boundaries. Do nations have secession rights? Do cultural groups have territorial claims? Can borders be redrawn justly? Nationalism emphasizes group identity; cosmopolitanism emphasizes universal human rights. Balancing these claims is central to understanding legitimate state formation and international justice.

Explainer

From your study of cosmopolitanism, you know that one major tradition in political philosophy holds that the morally fundamental unit is the individual human being, not the nation or the state. Basic rights and obligations flow from our common humanity, and political arrangements — borders, states, nations — are instruments we should evaluate by how well they serve human flourishing regardless of national identity. Nationalism is the competing tradition: it holds that cultural, linguistic, and historical communities constitute a distinct kind of political unit with its own claims, and that a people has an interest in governing itself that cannot simply be reduced to the aggregate interests of the individuals who compose it.

Self-determination is the principle that brings this tension into political reality. At its simplest, it holds that a "people" — a group defined by shared culture, language, history, or territory — has the right to determine its own political status, including potentially establishing or joining an independent state. The principle was written into international law after World War I and was invoked in decolonization movements throughout the twentieth century. But almost immediately it raises the question that has never been satisfactorily answered: *who counts as a "people"?* The Kurds, the Tibetans, the Québécois, the Scots — each represents a cultural and linguistic community within a larger state. The world contains thousands of such groups. If each has a right of self-determination, the implication is either thousands of new states or permanent political instability.

The question of secession rights sharpens this further. Two broad theories have emerged. Plebiscite theories hold that any geographically concentrated group with a clear majority preference for independence has a right to secede, full stop — self-determination is rooted in consent and democratic choice. Just cause theories, associated with philosophers like Allen Buchanan, hold that secession is only justified when a group has suffered serious injustice — persecution, territorial annexation, systematic discrimination — and that absent such grievances, existing state borders should be presumed legitimate. The just cause view preserves more state stability but seems to tell groups with genuine cultural distinctiveness, like the Québécois, that they have no right to independence if their material situation is comfortable enough.

Nationalism also intersects with cosmopolitanism on the question of territorial claims. Do nations have claims to specific territory? If a people was displaced — as many Indigenous peoples were by colonial conquest — do they retain claims to their ancestral territories? The historical record of how most state borders were drawn (war, conquest, colonial partition) makes it very difficult to argue that current boundaries reflect any principled principle of legitimacy. Yet redrawing them wholesale would itself involve enormous human costs. The honest conclusion is that self-determination and nationalism are not simply principles to be applied but tensions to be navigated — between cultural recognition and universal rights, between historical claims and present stability, between the value of political community and the cosmopolitan demand that no one's fate be determined by the arbitrary lottery of birth nationality.