This volume describes the various movements and parties, across all six continents, that wanted social change through state transformation. It begins with a reconstruction of social democracy's trajectories from the 1870s until the present. The evolution of socialism on different continents is illustrated through a number of national case studies. Experiments at a subnational level (for example, municipal socialism) are also explored, as are the varying experiences of international umbrella organizations. The next part focuses on divergent socialist experiments and ideologies in several parts of the world, including South Asia, Africa, the Arab world, Brazil, Venezuela, and Israel/Palestine, followed by an overview of 'independent' socialist movements, including left-socialist parties of the 1930s and the post-war period, and the global New Left since its beginnings in the 1950s. The volume concludes with critical essays on socialism's long-term and global development.