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| 1916, April 3 |
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| A Pan-American high commission, meeting in Buenos Aires, worked out a scheme for improvement of telegraph and railway communication. A permanent high commission was created to elaborate uniform commercial laws. | 1 |
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| 1923, March–May |
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| The fourth Pan-American conference at Santiago resulted in accords providing for fact-finding commissions in cases of disputes, in addition to many resolutions touching health, education, etc. | 2 |
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| May 3 |
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| Signature of the Pan-American Treaty for the pacific settlement of disputes. | 3 |
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