When people ask about the last war Mexico was in, the immediate answer is not a single recent conflict but a layered history of internal struggle and external intervention. The country has not fought a conventional war against a foreign state since the United States occupation of Mexico City in 1847, yet the legacy of that era continues to shape national identity. Understanding this requires looking at the major 19th-century conflicts and the complex relationship with military force in the modern era.
The Mexican-American War: The Defining Conflict
For most historians and citizens, the last major war Mexico engaged in was the Mexican-American War, which lasted from 1846 to 1848. This brutal conflict was born from the annexation of Texas and a dispute over the southern border of the United States. The United States aimed to expand its territory significantly, a goal often described as Manifest Destiny, while Mexico viewed the American advance as a direct violation of its sovereignty.
Key Battles and Territorial Losses
The war was marked by significant battles that resulted in devastating losses for Mexico. The Siege of Veracruz, the Battle of Chapultepec, and the storming of Mexico City led to the capture of the capital and the eventual signing of the Treaty of Guadalupe Hidalgo in 1848. This treaty forced Mexico to cede approximately 55% of its pre-war territory, including what is now California, Nevada, Utah, and parts of Arizona, New Mexico, Colorado, and Wyoming.
The Reform War and French Intervention
In the decades following the loss to the United States, Mexico remained volatile, experiencing the Reform War (1857-1861) between liberal and conservative factions. This internal conflict destabilized the nation and created the conditions for the Second French Intervention. The French, under Napoleon III, sought to establish a monarchy in Latin America, installing Maximilian I of Mexico as emperor.
Resistance and the Execution of Maximilian
The French occupation faced fierce resistance from Republican forces led by figures such as Benito Juárez. The conflict drained French resources, and with the end of the American Civil War, the United States pressured Napoleon III to withdraw. The Republicans captured and executed Maximilian in Querétaro in 1867, marking the end of the foreign monarchy and restoring the republic.
20th Century and the Role of the Military
After the violence of the 19th century, Mexico entered the 20th century with a strong anti-military sentiment among the civilian population. The Mexican Revolution (1910-1920) had reshaped the government, and the Institutional Revolutionary Party (PRI) maintained control for much of the 20th century by keeping the military out of direct political governance and internal security duties.
The Tampico Affair and Border Incursions
While large-scale warfare ceased, Mexico did engage in military actions related to border security. The Tampico Affair in 1914 was a significant diplomatic incident during the Mexican Revolution where US sailors were arrested, leading to a brief US occupation of Veracruz. Additionally, Mexico cooperated with the United States during World War II by declaring war on the Axis powers in 1942, primarily to support the Allies with resources and to allow the Mexican Air Force, the Escuadrón 201, to fight in the Philippines.
Modern Era and the Drug War
Today, the discussion regarding the "last war" often shifts to the Mexican Drug War, which began around 2006. This is not a war against a foreign state but a violent internal conflict between the government and powerful drug trafficking organizations. The armed forces and federal police are deployed domestically to combat cartels, resulting in significant casualties and human rights concerns, though it is classified as an internal security operation rather than a formal war.
