Prominent normative theories for accommodating minority national groups appeal to the value of national cultures and/or the psychology of group recognition. This article aims to show that an argument from political authority provides a better justification. Building on Joseph Raz's theory of authority, the article argues that members of minority national groups are disadvantaged in relation to their majority counterparts under standard democratic institutions; such institutions do not provide minority national groups with comparable access to the conditions for legitimate political (...) authority. Constitutional arrangements for accommodating minority national groups—such as territorial self-government or power-sharing—are justified insofar as they might offset this disadvantage. (shrink)