This study addresses the provincial origins and role of the reactionary party that legislated the reconstruction of the Brazilian monarchy, perhaps Latin America's most stable nineteenth-century political regime. The study locates the party in terms of regional power, taking into account social, economic, and political factors. It analyzes the party's ideology in the historical context of the Regency (1831–1840) and its immediate aftermath, an era of destabilization, social war, and secessionism. The study also demonstrates how the party mobilized partisan support nationally to consolidate party and state power, the unexpected impact of patronage, and the increasingly autonomous quality of state power over time.