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| 1938, June |
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| The boundary dispute with Ecuador threatened to end in war when the troops of the two states clashed on the frontier. On Oct. 12, Ecuador appealed to several American presidents to mediate, but Peru took an uncompromising attitude toward Ecuadorian demands for cession of territory. | 1 |
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| 1939–45 |
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| Manuel Prado Ugarteche, president. | 2 |
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| 1942, Jan. 24 |
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| Peru severed diplomatic relations with Germany, Italy, and Japan. | 3 |
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| 1945, June 10 |
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| José Luis Bustamente was elected president, supported by Liberal and Aprista forces. (See Peru) | 4 |
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