1846 in Mexico

Events in the year 1846 in Mexico.

Incumbents

Aguascalientes: Felipe Nieto y del Portillo/Felipe Cosio
Chiapas: Jerónimo Cardona
Chihuahua: Ángel Trías Álvarez/Mauricio Ugarte/Cayetano Justiniani/José María Irigoyen Rodríguez/Ángel Trías Álvarez
Coahuila: Rafael Vázquez/José María de Aguirre González/Santiago Rodríguez del Bosquea
Durango:
Guanajuato:
Guerrero:
Jalisco: Antonio Escobedo/Juan Nepomuceno Cumplido/José María Yáñez/Joaquín Angulo
State of Mexico:
Michoacán:
Nuevo León: Pedro de Ampudia
Oaxaca:
Puebla:
Querétaro: Julián Juvera
San Luis Potosí:
Sinaloa:
Sonora:
Tabasco:
Tamaulipas: Juan Martin de la Garza Flores/Manuel Núñez Ponce/Manuel Saldaña/Francisco Vital Fernandez
Veracruz: Manuel Gutiérrez Zamora/José de Emparán/Manuel Gutiérrez Zamora
Yucatán: Miguel Barbachano
Zacatecas:

April 25 – Mexican–American War: Open conflict begins over border disputes of Texas's boundaries.
May 8 – Mexican–American War – Battle of Palo Alto: Zachary Taylor defeats a Mexican force north of the Rio Grande at Palo Alto, Texas, in the first major battle of the war.
May 9 – Mexican–American War – Battle of Resaca de la Palma in Brownsville, Texas
May 13 – Mexican–American War: The United States declares war on Mexico.
June 10 – Mexican–American War: The California Republic declares independence from Mexico.
June 14 – Bear Flag Revolt: American settlers in Sonoma, California, start a rebellion against Mexico and proclaim the California Republic.
July 7 – Acting on instructions from Washington, DC, Commodore John Drake Sloat orders his troops to occupy Monterey and Yerba Buena, thus beginning the United States annexation of California.
August 6 – José Mariano Salas assumes the presidency as provisional president.
August 22 – President Salas decrees the 1824 Constitution of Mexico in effect again.
September 21–24 – Battle of Monterrey