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| 1922, Jan.–1924, Jan |
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| The Marxist Felipe Carrillo Puerto was governor of Yucatán. Diverging from the conservatism of his predecessors, he initiated widespread agrarian reform, extensively redistributing land. Turning the revolution into a distinct regional movement, he mobilized campesinos around his Southeast Socialist Party (PSS). His regional radicalism aroused opposition from Obregón, and Carrillo was deposed and killed during the de la Huerta revolt. | 1 |
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| 1923, Dec. 6 |
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| Adolfo de la Huerta led a revolt against the government of Obregón and the latter's candidate for the presidency, Calles. The U.S. government supported Obregón, who was able to crush the insurrection (1924). | 2 |
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| 1924–28 |
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| PLUTARCO ELÍAS CALLES (1877–1945), president. The authoritarian Calles ruled Mexico directly or indirectly for a decade, a period known as the MAXIMATO. After a long and serious controversy with the U.S. regarding the application of the constitution to foreign properties, Calles agreed that American oil companies would not need to apply for new concessions (1927, Calles-Morrow agreement). | 3 |
| Because of the prosperity of the mid-1920s Calles was able to continue some agrarian and educational reform, but soon came into conflict with the Roman Catholic Church over the application of constitutional provisions. | 4 |
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| 1926, July 31 |
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| The archbishop of Mexico declared a strike against the state, leading to a GREAT INSURRECTION, known as the “CRISTERO REVOLT,” which soon affected a dozen provinces. The Cristeros called for an end to the oppressive measures the government had implemented against the Catholic Church, and a return to the religious and ethnic autonomy of earlier years. In the struggle Calles proved himself the strongman of Mexico by proceeding with great vigor against the rebels. Most of the leaders were defeated, captured, and executed by late 1927, but several areas remained in revolt beyond the end of Calles's term in 1928. | 5 |
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| 1927, Feb |
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| The Church publicly repudiated the Constitution of 1917, but the government (Feb. 11) ordered nationalization of Church property and began to close Church schools. Foreign priests, monks, and nuns were deported. | 6 |
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| 1928, July 1 |
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| Obregón was reelected president, but was assassinated a few weeks later (July 17) by a devout Catholic. He was the fourth key revolutionary leader (besides Zapata, Carranza, and Villa) to be assassinated. | 7 |
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| 1928–30 |
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| Emilio Portes Gil served as provisional president. Calles, however, remained the real power in the regime. | 8 |
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| 1929, March–April |
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| Calles put down another insurrection, provoked by political and religious discontent and led by Gens. Jesús María Aguirre and Gonzalo Escobar. | 9 |
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| June 21 |
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| A compromise agreement was reached with the Church. | 10 |
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| Aug. 11 |
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| Promulgation of an extensive labor code, in accordance with the 1917 constitution: eight-hour day, six-day week, right to strike, minimum wage, compulsory insurance, etc. | 11 |
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