I examine the possibility that the trans-Atlantic slave trades influenced the political institutions of villages and towns in precolonial Africa. Using anthropological data, I show that villages and towns of ethnic groups with higher slave exports were more politically fragmented during the precolonial era. I use instrumental variables to show that the relationship is at least partly causal. I argue this fragmentation is important for relative economic development because it still influences political institutions today. I support this argument by using more contemporary data to show that areas with higher precolonial political fragmentation have a higher incidence of bribery.