The current Constitution of Mexico, formally the Political Constitution of the United Mexican States, was drafted in Santiago de Querétaro, in the State of Querétaro, Mexico, by a constituent convention during the Mexican Revolution. It was approved by the Constituent Congress on 5 February 1917, and was later amended several times. It is the successor to the Constitution of 1857, and earlier Mexican constitutions. "The Constitution of 1917 is the legal triumph of the Mexican Revolution. To some it is the revolution."