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| 1944, Sept. 29 |
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| President Roosevelt called attention to the “growth of Nazi-Fascist influence” in Argentina and the failure of the Argentine government to fulfill its inter-American obligations. U.S. ships were forbidden to call at Argentine ports. | 1 |
| The Mexican government agreed to pay $24 million with interest at 3 percent for the property of U.S. oil companies expropriated in 1938. | 2 |
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| 1945, Feb. 21–March 8 |
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| Inter-American conference on problems of war and peace met in Mexico City. The United States offered an “economic charter for the Americas,” to promote orderly reconversion and raise the standard of living. In addition, the U.S. government guaranteed for the duration of the war to aid any American state if its political independence or territorial integrity were attacked by a neighbor. | 3 |
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| March 3 |
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| The Act of Chapultepec was approved by the delegates of 19 American republics, providing for joint action to guarantee each American state against aggression. The states of the Western Hemisphere were to act collectively in their own defense unless and until the World Security Council should take effective measures to deal with an attack. | 4 |
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| March 27 |
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| The Argentine republic declared war on Germany and Japan. One week later (April 4) the governing board of the Pan-American Union admitted Argentina to membership and the Argentine regime was recognized (April 9) by the United States, Great Britain, and France. | 5 |
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