Siete Leyes
Las Siete Leyes (Spanish: [las ˈsjete ˈleʝes], or Seven Laws was a constitution that fundamentally altered the organizational structure of Mexico, away from the federal structure established by the Constitution of 1824, thus ending the First Mexican Republic and creating a unitary republic, the Centralist Republic of Mexico. Formalized under President Antonio López de Santa Anna on 15 December 1835, they were enacted in 1836.