This important volume investigates the many forms of Catholic activism in Latin America between the 1890s and 1962 (from the publication of the papal encyclical Rerum Novarum to the years just prior to the Second Vatican Council). It argues that this period saw a variety of lay and clerical responses to the social changes wrought by industrialization, political upheavals and mass movements, and increasing secularization. Spurred by these local developments as well as by initiatives from the Vatican, and galvanized by national projects of secular state-building, Catholic activists across Latin America developed new ways of organizing in order to effect social and political change within their communities.