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| 1915, Jan. 27 |
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| Obregón recaptured Mexico City for the Constitutionalists. | 1 |
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| March 29 |
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| Carrancista forces under Gen. Salvador Alvarado entered Mérida, Yucatán, deposing Abel Ortíz Argumedo. The region had been quiet up to that point, largely because the rural peasantry had been devastated by the Caste War of the 1840s and was living in such restrictive, slavelike conditions that organization was nearly impossible. Initiating reform from the top down, Alvarado freed labor by ending debt peonage and engaged in limited mobilization of the workers, encouraging some urban unions and peasant leagues. | 2 |
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| April |
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| Pancho Villa's 25,000-strong army was defeated at the Battle of Celaya by forces under the command of Alvaro Obregón. Using techniques gleaned from the battlefields of Europe, and arms supplied by the U.S., Obregón devastated Villa's forces, killing 5,000 and wounding 6,000 more, while losing only a few hundred men. The battle marked the beginning of the end for Villa and the emergence of Carranza as the ultimate victor in the war. | 3 |
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| Oct. 19 |
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| The U.S. government and a number of Latin American states recognized Carranza as de facto president. Great Britain followed suit (Nov. 16). | 4 |
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