Hookworm Eradication as a Natural Experiment for Schooling and Voting in the American South

Educational attainment is robustly associated with greater political participation, yet the causal nature of this finding remains contested. To assess this relationship, I leverage a natural experiment in the Rockefeller Sanitary Commission’s (RSC) anti-hookworm campaign, which exogenously expanded primary and secondary education in the early-twentieth century American South. I evaluate two RSC hookworm interventions: exposure to the campaign and proportion treated. I use genetic matching to control for observable factors that influenced the haphazard dispensing of treatment, and implement new matching methods for continuous campaign interventions. I also use a variety of methods to assess the robustness of the results to a number of alternative accounts. Throughout, I find a consistent positive effect of education on participation, suggesting additional evidence for a causal interpretation of the ‘education effect’.