Reform War
The Reform War (17 December 1857 – 11 January 1861) or War of Reform (Spanish: Guerra de Reforma), also known as the Three Years' War (Spanish: Guerra de los Tres Años) and the Mexican Civil War, was a complex civil conflict in Mexico that was fought between Mexican liberals and conservatives with regional variations over the promulgation of Constitution of 1857. It has been called the "worst civil war to hit Mexico between the War of Independence of 1810–21 and the Revolution of 1910–20." Following the liberals' overthrow of the dictatorship of the conservative Antonio López de Santa Anna, the liberals passed a series of laws that codified their political program that were incorporated into the new constitution.