From the publisher: The twentieth century saw the rise of two important and interrelated norms. The first is the norm of self-determination, which advances the right of stateless nations to govern themselves. The second is the norm of territorial integrity, which upholds the principle that political borders should be respected. A consequence of these norms has been an increase in secessionism, a decline in conquest, and a proliferation of states. This paper will examine the development of these norms, their interrelationship, and their prospects for the future. Attention will be given to three important questions: (1) Under what conditions does a norm endure beyond a power transition? (2) How likely is an ascendant China or India to support the norms? (3) What does a power transition and the corresponding support of these norms augur for the future of secession, conquest, and the number of sovereign states?