Are long-standing, widespread grievances a necessary condition for civil resistance campaigns? We argue historical framing can enable sudden mass uprisings even where long-standing anti-regime grievances are absent. Protest cascades can develop to challenge relatively stable, popular governments through four interdependent historical framing mechanisms. First, protesters and bystanders may draw analogies to historical contentious episodes. Second, individuals or groups may imagine themselves occupying paradigmatic roles from past popular struggles, offering prescriptions for action. Third, protesters can adopt symbolic and tactical repertoires from previous contentious episodes. Finally, protesters may concentrate protests within symbolic space. We develop our theory with evidence from Nicaragua’s 2018 mass uprising, which nearly toppled previously-popular President Daniel Ortega, after violence against protesters activated powerful frames resonating with Nicaragua’s history of dictatorship and revolution.