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| 1925–27 |
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| He was succeeded by Emiliano Figueroa Larrain. | 1 |
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| 1927–31 |
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| Larrain was in turn forced out by Gen. Carlos Ibáñez, who made himself dictator-president, and then promoted many of the social reforms and public works that Alessandri had advocated. | 2 |
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| 1929, June 3 |
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| Settlement of the Tacna-Arica question, which had embittered the relations of Chile and Peru for many years (diplomatic relations severed 1910). Efforts of the U.S. (1922–26) to mediate a settlement through a plebiscite led to no result, but served to bring about direct negotiations and the final agreement, by which Chile received Arica and Peru was awarded Tacna, Chile agreeing to accede Peru port and transportation facilities at Arica. Chile retained all territory taken from Bolivia, but granted Bolivia a railway outlet to the Pacific. Thenceforth Chile and Bolivia drew closer. | 3 |
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| 1931 |
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| Ibáñez resigned because of high unemployment, riots, challenges from the extreme Left and Right, and finally a general strike. In many ways a victim of the Great Depression, he fled to Argentina. | 4 |
| Juan Montero, representative of the conservative elements, was elected in opposition to Alessandri. Political and social unrest continued. | 5 |
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| 1932, June 4 |
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| Montero was overthrown. Numerous coups followed, including one, led by Air Force Comdr. Marmaduke Grove, which declared Chile a socialist republic during its 12-day tenure. Eventually a junta headed by Carlos Dávila assumed power and proclaimed Chile a socialist republic, which survived only ten days. | 6 |
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| Sept. 13 |
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| Dávila was overthrown by a military coup and Alessandri became president once more, after an election (Dec. 24). | 7 |
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