The Colombian government recently concluded a decades-long civil war by signing a peace agreement with the largest of its opposing guerrilla armies: Fuerzas Armadas Revolucionarias de Colombia (Revolutionary Armed Forces of Colombia, or FARC). It has also been involved in negotiations with the other major rebel group, Ejército Nacional de Liberación (National Liberation Army, or ELN). Both groups have been fighting the Colombian government since the early 1960s. Divisions in Colombian society over how to end the war with the FARC that bedeviled the protracted peace negotiations in Havana, Cuba, and led to the Colombian people’s initial rejection of the peace agreement are enduring challenges to a sustainable peace. These divisions are likely to reappear as the rebels demobilize, surrender their role in narcotics trafficking, and re-enter Colombian society and politics.