After a long period of chaos, political order in Colombia emerged in the mid-1900s. This transition was driven by a change in the institutional allocation of political power. After the Thousand Days’ War, Colombia’s two parties agreed to share power by means of a new set of electoral rules. The incomplete vote, the cornerstone of the new electoral rules, was a strategic concession by the Conservative government to the Liberal opposition. In exchange for permanent representation in the legislatures, Liberals abandoned military insurrection as a political strategy. Transition to proportional representation was completed in 1929 with the introduction of the quotient rule. The quotient rule was also a concession from the government. However, it was not driven by Liberalism’s potential military power but by the institutional power that Liberalism had accumulated since the first concession.