In addition to revising our view of the interwar period and the building of European democracies, this book cuts against the grain of most current theorizing in political science by explicitly discussing when and how ideas influence political behavior. Even though German and Swedish Social Democrats belonged to the same transnational political movement and faced similar political and social conditions in their respective countries before and after World War I, they responded very differently to the challenges of democratization and the Great Depression--with crucial consequences for the...