Mexico was a neutral country in the Great War (World War I) that lasted from 1914 to 1918. The Great War broke out in Europe in August 1914 as the Mexican Revolution was in the midst of full-scale civil war between factions that had helped oust General Victoriano Huerta from the presidency earlier that year. The Constitutionalist Army of Venustiano Carranza under the generalship of Alvaro Obregón defeated the army of Pancho Villa in the Battle of Celaya in April 1915.
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Background
After the Battle of Celaya in April 1915, the violence in Mexico was largely restricted to local fights, especially guerrilla fights in Morelos under the leadership of Emiliano Zapata. The partial peace allowed a new Mexican Constitution to be drafted in 1916 and proclaimed on February 5, 1917. Foreign oil companies felt threatened by the new constitution, which empowered the Mexican government to expropriate natural resources deemed vital to the nation. Mexico was in constant threat of being invaded by the U.S., which wanted to take control of Tehuantepec Isthmus and Tampico oil fields. Germany made several attempts to incite a war between Mexico and the U.S., seen especially in the Zimmermann Telegram affair in January 1917, where the aim was to draw the U.S. into conflict on its southern border rather than join Great Britain and France in the conflict against Germany and its allies.
Relationship with the United States
Mexican neutrality in the Great War reflected a hostility toward the U.S., due to several earlier U.S. interventions in Mexican internal affairs. In February 1913, Victoriano Huerta had conspired with the U.S. ambassador Henry Lane Wilson to oust Francisco I. Madero from the presidency of Mexico. The coup d'état was the culmination of violence in Mexico City, known as the Ten Tragic Days (La decena trágica), in the waning days of the William Howard Taft presidency. President Woodrow Wilson also ordered the invasion of Veracruz in 1914, resulting in the death of 170 Mexican soldiers and an unknown number of civilians.
The relationship between Woodrow Wilson and Venustiano Carranza, whose political position had been aided by U.S. recognition in October 1915, allowing U.S. arms sales to Carranza's faction against its main rival General Pancho Villa, was initially cordial. Villa retaliated against the United States, attacking Columbus, New Mexico in 1916. Wilson sent U.S. Army General John J. Pershing into Mexico for punitive action to capture Villa. The Pancho Villa Expedition was a failure, since Villa eluded U.S. forces. Carranza, a strong nationalist, asserted Mexico's sovereignty and ordered the U.S. Army out. U.S. interests were threatened by the proclamation of the Mexican Constitution of 1917 and Mexico was in constant threat of being invaded by the U.S.
Extent of involvement in the war
These facts marked the participation of Mexico in the Great War.