Events in the year 1843 in Mexico.
Incumbents President: until March 4: Nicolás Bravo March 4 – October 4: Antonio López de Santa Anna starting October 4: Valentín Canalizo
Governors Aguascalientes: Mariano Chico Navarro Chiapas: Ignacio Barberena Chihuahua: Mariano Monterde/Mariano Martínez de Lejarza/Mariano Monterde Coahuila: Francisco Mejía/José Juan Sánchez Estrada Durango: Guanajuato: Guerrero: Jalisco: Mariano Paredes y Arrillaga/José María Jarero/José Antonio Mozo State of Mexico: Michoacán: Nuevo León: Manuel María de Llano Oaxaca: Puebla: Querétaro: Julián Juvera San Luis Potosí: Sinaloa: Sonora: Tabasco: Tamaulipas: Francisco Vital Fernandez/Jose Ignacio Gutierrez/Juan Nepomuceno Cortina Veracruz: Yucatán: Miguel Barbachano Zacatecas:
Events April 30 – May 16 – Naval Battle of Campeche: Naval Battle between the Mexican Navy versus the Texas Navy and the Yucatán Navy. The battle featured the most advanced warships of its day. August 23 – President Antonio López de Santa Anna announced that the annexation of Texas by the United States would be considered an act of war by Mexico.
Notable deaths March 21 — Guadalupe Victoria, 1st President of Mexico (b. 1786)
Notes