Mexican Revolution: Mexicali is captured by the Mexican Liberal Party, igniting the Magonista rebellion of 1911.

The Mexican Revolution was an extended sequence of armed regional conflicts in Mexico from 20 November 1910 to 1 December 1920. It has been called "the defining event of modern Mexican history". It saw the destruction of the Federal Army, its replacement by a revolutionary army, and the transformation of Mexican culture and government. The northern Constitutionalist faction prevailed on the battlefield and drafted the present-day Constitution of Mexico, which aimed to create a strong central government. Revolutionary generals held power from 1920 to 1940. The revolutionary conflict was primarily a civil war, but foreign powers, having important economic and strategic interests in Mexico, figured in the outcome of Mexico's power struggles; the U.S. involvement was particularly high. The conflict led to the deaths of around one million people, mostly non-combatants.

Mexicali is the capital city of the Mexican state of Baja California. The city, which abuts the Mexico–United States border and the U.S. city of Calexico, California, is the seat of the Mexicali Municipality. It has a population of 689,775, according to the 2010 census, while the Calexico–Mexicali metropolitan area is home to combined 1,000,000. Mexicali is a regional economic and cultural hub for the border region of The Californias.

The Capture of Mexicali, or the Battle of Mexicali, was the first action of the Mexican Revolution taken by rebel Magonistas against the federal government of Porfirio Díaz. Under the direction of Ricardo Flores Magón, a group of rebels captured the border town of Mexicali, Baja California, with little resistance.

The Mexican Liberal Party was founded in August 1900 when engineer Camilo Arriaga published a manifesto entitled Invitacion al Partido Liberal. The invitation was addressed to Mexican liberals who were dissatisfied with the way the government of Porfirio Díaz was deviating from the liberal Constitution of 1857. Arriaga called on Mexican liberals to form local liberal clubs, which would then send delegates to a liberal convention.