charts the evolving meanings of citizenship in Argentina from the 1880s to the 1980s. Against the backdrop of immigration, science, race, sport, populist rule, and dictatorship, the contributors analyze the power of the Argentine state and other social actors to set the boundaries of citizenship. They also address how Argentines contested the meanings of citizenship over time, and demonstrate how citizenship came to represent a great deal more than nationality or voting rights. In Argentina, it defined a person’s relationships with, and expectations of, the state. Citizenship conditioned the rights and duties of Argentines and foreign nationals living in the country. Through the language of citizenship, Argentines explained to one another who belonged and who did not. In the cultural, moral, and social requirements of citizenship, groups with power often marginalized populations whose societal status was more tenuous. also demonstrates how workers, politicians, elites, indigenous peoples, and others staked their own claims to citizenship.