Drawing on unparalleled evidence from two centuries of education provision in Europe and the Americas, and deploying rich data that capture the expansion of primary education and its characteristics, this sweeping book offers a political history of primary schools that is both broad and deep. Paglayan shows that governments invested in primary schools when internal threats heightened political elites’ anxiety around mass violence and the breakdown of social order. Two hundred years later, the original objective of disciplining children remains at the core of how most public schools around the world operate. The future of education systems—and their ability to reduce poverty and inequality—hinges on our ability to understand and come to terms with this troubling history.