Abstract

This paper shows how enduring agrarian institutions shaped the long-run political consequences of historical shocks. We study Italy’s sharecropping system (mezzadria) — a centuries-old fifty-fifty contract that structured rural relations across central Italy — and link its prewar prevalence to Socialist and Communist voting from 1913 to 1948. Using harmonized data for 720 agrarian zones and a combination of cross-sectional, entropy-balanced, and spatial RDD designs, we find that sharecropping was politically neutral before World War I but became a center of rural unrest and Fascist repression afterward. Areas with more sharecroppers experienced greater strike activity, targeted violence, and enduring left alignment. A daily panel of 1921 events shows repression peaking during annual contract renewals. The results reveal a “revolt-repression-realignment” mechanism through which local economic institutions converted wartime shocks into lasting partisan divides.