In the early 1920s the Bolsheviks, who were overwhelmingly urban, proletarian, and Russian, believed that rapid industrialization would dissolve the non-Russian national identities and create a solid base of support for the new political order. By the end of the decade, however, the social changes initiated by rapid economic development strengthened national assertiveness. This book analyzes the precarious relationship between Soviet legitimacy-building and the consequences of rapid industrial development in the Ukrainian Soviet Socialist Republic, the most populous non-Russian republic in the USSR, during the 1920s and 1930s. The author shows how the interplay between industrialization, urbanization, and Soviet preferential policies produced a modern, urban Ukrainian identity. This, he argues, explains why the Stalinist leadership changed its course on the nationality question in the 1930s and gave precedence to the Russians in the USSR.