This book explores the scope of reforms and changes in the social protection systems in Latin America that have started at the beginning of the 21st century. It describes how and to what extent changes in social protection systems and social policies have occurred in the region in recent decades. Taking a comparative approach, the volume identifies the triggers for the transformations and how such pressures are received by the welfare regime, or a specific policy sector, to finally yield a given type of reform. The analysis is characterized by the presence of certain factors that explain the development of social protection systems in Latin America, such as economic growth, the consolidation of democratic political regimes, and the region's Left Turns. The book also examines to what extent common challenges and processes induced by international institutions have led to convergence among countries or welfare regimes, or whether each maintains its own identity.