This volume discusses the application of causal inference techniques in the study of American political development (APD). Within political science, a movement focused on increasing the credibility of causal inferences (CI) has gained considerable traction in recent years. While CI has been incorporated extensively into most disciplinary subfields, it has not been applied often in the study of APD. This edited volume considers ways in which scholars of CI and APD can engage in mutually beneficial ways to produce better overall research.