The Mexican Revolution (1910-1920)

Francisco I. Madero, who had been jailed by Porfirio Diaz to prevent him from running in the 1910 presidential election, escapes to Texas and issues the Plan of San Luis Potosi. The plan declares the recent election invalid, calls for an armed uprising against Diaz's 30-year dictatorship, and promises land reform. Madero sets November 20, 1910, as the date for the insurrection to begin. The call to arms ignites revolts across Mexico, particularly in the northern state of Chihuahua led by Pascual Orozco and Pancho Villa. Under Diaz's rule, Mexico had modernized its infrastructure and attracted foreign investment, but the benefits were concentrated among a small elite. The hacienda system concentrated land ownership, foreign companies controlled mining, oil, and agriculture, and indigenous communities were displaced from communal lands. The rurales (rural police) enforced order on behalf of large landowners.

After six months of fighting, revolutionary forces capture Ciudad Juarez, compelling Porfirio Diaz to resign the presidency and go into exile in France. Diaz, who had ruled Mexico for over 30 years, had modernized the country's infrastructure and attracted foreign investment but at the cost of severe inequality, political repression, and the concentration of land ownership. Francisco Leon de la Barra serves as interim president until elections can be held. Francisco Madero returns from exile to a hero's welcome.

Francisco I. Madero is elected president in a landslide, but his moderate reform agenda and reluctance to implement rapid land redistribution frustrates more radical revolutionaries. In November, Emiliano Zapata issues the Plan of Ayala, denouncing Madero's failure to fulfill land reform promises. The plan calls for the expropriation of large estates (haciendas) and the return of land to peasant communities. Zapata's slogan "Tierra y Libertad" (Land and Liberty) becomes the rallying cry of the agrarian movement. Zapata breaks with Madero and takes up arms against his government.

A military coup against President Madero unfolds over ten days of street fighting in Mexico City, known as La Decena Tragica (the Ten Tragic Days). General Victoriano Huerta, commander of the federal forces, secretly allies with the rebels. With the support of US Ambassador Henry Lane Wilson, Huerta arrests Madero and Vice President Pino Suarez. On February 22, both are shot dead while being transferred to prison. Huerta declares himself president, triggering a new phase of the revolution as former allies unite against him.

US President Woodrow Wilson, refusing to recognize Huerta's government, orders US forces to occupy the port of Veracruz after a dispute over arms deliveries. The occupation lasts seven months and kills over 200 Mexican soldiers and civilians. The United States had significant economic interests in Mexico, including mining, oil, and agricultural investments that shaped its involvement in the revolution. Meanwhile, Venustiano Carranza forms the Constitutionalist Army, an alliance including Pancho Villa's northern forces, and advances south. Under military pressure from multiple fronts, Huerta resigns in July 1914 and flees to Spain. Carranza's Constitutionalist faction emerges as the dominant revolutionary force.

Revolutionary leaders convene at the Convention of Aguascalientes to determine Mexico's future government. The convention brings together Carranza, Villa, and Zapata, but deep disagreements over land reform, military command, and political structure prevent a unified government. Villa and Zapata break with Carranza, leading to a civil war within the revolution. Villa and Zapata's forces occupy Mexico City jointly in December 1914, but fail to establish a stable alternative government. The convention's failure prolongs the conflict by three more years.

The Constitutionalist Army under General Alvaro Obregon defeats the forces of Pancho Villa in a series of battles at Celaya, the largest battle of the revolution. Obregon's use of modern trench warfare tactics, machine guns, and barbed wire, combined with Villa's impetuous cavalry charges, results in a decisive victory for the Constitutionalists. Villa loses over 4,000 men. The battle marks the end of Villa's military dominance and establishes the Constitutionalist faction as the definitive power in Mexico.

Pancho Villa, whose forces have been reduced to guerrilla operations, raids the border town of Columbus, New Mexico, killing 18 US citizens and burning much of the town. Villa's stated rationale was retaliation against the United States for recognizing Carranza's government and supplying his enemies. The attack prompts US President Woodrow Wilson to send a Punitive Expedition of 10,000 troops under General John J. Pershing into Mexico to capture Villa. The expedition fails to find Villa and is withdrawn in 1917 as US attention shifts to World War I.

Venustiano Carranza, now recognized as president, convenes a constitutional convention in Queretaro that drafts a new Mexican constitution, which remains in effect today. The 1917 Constitution is one of the most progressive of its era, establishing land reform (Article 27), labor rights including the eight-hour workday and minimum wage (Article 123), separation of church and state, and expanded education. Women, including the soldaderas who served as soldiers, nurses, and logistics staff across all factions during the revolution, were not granted voting rights by the constitution — that right would not come until 1953. While the constitution embodied many of the revolution's social demands, enforcement would be inconsistent for decades. Carranza is formally elected president under the new constitution in March 1917.

Emiliano Zapata is lured to the Hacienda de Chinameca in Morelos under the pretext of meeting a defecting colonel and is shot dead by Carranza's soldiers. Zapata's assassination removes the most powerful advocate for peasant land reform. His death transforms him into a martyr and enduring symbol of social justice in Mexico. The Zapatista movement continues to influence Mexican politics for generations. The Zapatista Army of National Liberation (EZLN) uprising in 1994 explicitly invoked Zapata's legacy.

President Carranza is assassinated while fleeing Mexico City after attempting to impose a handpicked successor, prompting northern generals Alvaro Obregon, Plutarco Elias Calles, and Adolfo de la Huerta to rebel under the Plan of Agua Prieta. Carranza's death marks the end of the Constitutionalist phase of the revolution. Adolfo de la Huerta serves as interim president. Obregon is elected president in November 1920, and his presidency is widely considered the endpoint of the revolutionary armed conflict phase.

Alvaro Obregon is elected president in a landslide victory, beginning a period of reconstruction and consolidation. Obregon implements land reform programs, expands education, and pursues cultural and diplomatic recognition from the United States. His presidency marks the transition from armed conflict to institutionalized revolutionary governance. The National Revolutionary Party (PNR), founded in 1929 by Plutarco Elias Calles, would evolve into the Institutional Revolutionary Party (PRI) that dominated Mexican politics for over 70 years. The Mexican Revolution is considered the defining event of modern Mexican history.

The anti-clerical provisions of the 1917 Constitution (Articles 3, 24, 27, and 130), which restricted religious education, public worship, and church property, sparked the Cristero War (1926-1929). Catholic peasants and militants in central and western Mexico took up arms against the federal government under the slogan "Viva Cristo Rey" ("Long live Christ the King"). The conflict killed an estimated 90,000 people before being resolved through diplomatic mediation by the Catholic Church and the Mexican government. The war demonstrated that the revolution's secularizing agenda had produced significant resistance among the rural population, and the church-state tensions it exposed persisted for decades.

President Lazaro Cardenas (1934-1940) implements the most extensive land redistribution of the post-revolutionary era, distributing over 18 million hectares of land to ejidos (communal farms) and expropriating foreign oil companies to create Pemex, Mexico's state oil company. Cardenas's reforms represented the most thorough fulfillment of the revolution's social promises, though subsequent administrations scaled back land reform and many ejidos faced economic hardship. The PRI's seven-decade political dominance, ending with Vicente Fox's election in 2000, represented both the institutionalization and the corruption of the revolution's democratic aspirations. The revolution's legacy — land reform, labor rights, economic nationalism, and the tension between authoritarian governance and democratic ideals — continues to shape Mexican politics.