Between 1870 and 1920, two generations of European and American intellectuals created a transatlantic community of philosophical and political discourse. _Uncertain Victory_, the first comparative study of ideas and politics in France, Germany, the U.S., and Great Britain during these fifty years, demonstrates how a number of thinkers from different traditions converged to create the theoretical foundations for new programs of social democracy and progressivism. Kloppenberg studies a wide range of pivotal theorists and activists--including philosophers such as William James, Wilhelm Dilthey, and T. H. Green, democratic socialists such as Jean Jaur`es, Walter Rauschenbusch, Eduard Bernstein, and Beatrice and Sidney Webb, and social theorists such as John Dewey and Max Weber--as he establishes the connection between the philosophers' challenges to the traditions of empiricism and idealism and the activists' opposition to the traditions of laissez-faire liberalism and revolutionary socialism. By demonstrating a link between a philosophy of self-conscious uncertainty and a politics of continuing democratic experimentation, and by highlighting previously unrecognized similarities among a number of prominent 19th- and 20th-century thinkers, _Uncertain Victory_ is sure to spur a reassessment of the relationship between ideas and politics on both sides of the Atlantic.