The successful rebels established the First Mexican Republic. In 1824, a constitution of a federated republic was promulgated and former insurgent general Guadalupe Victoria became the first president of the newly born republic. Central America, including Chiapas, left the union. In 1829, former insurgent general and fierce Liberal Vicente Guerrero, a signatory of the Plan de Iguala that achieved independence, became president in a disputed election. During his short term in office, April to December 1829, he abolished slavery. As a visibly mixed-race man of modest origins, Guerrero was seen by white political elites as an interloper. His Conservative vice president, former Royalist General Anastasio Bustamante, led a coup against him and Guerrero was judicially murdered.  There was constant strife between Liberals, supporters of a federal form of decentralized government and often called Federalists and their political rivals, the Conservatives, who proposed a hierarchical form of government, were termed Centralists.