Inter‐American Treaty of Reciprocal Assistance
Inter‐American Treaty of Reciprocal Assistance (1947).The United States signed the Inter‐American Treaty of Reciprocal Assistance—popularly known as the Rio Treaty—with the twenty Latin American nations in 1947 in Brazil. This regional security pact, permitted under Article 51 of the United Nations Charter, incorporated the principle that an attack against one was to be considered an attack against all. Signatories would decide by a two‐thirds majority what kind of collective action might be taken against aggression. No nation would be required, however, to use force without its consent. The treaty continued the military cooperation that had characterized inter‐American relations during World War II. The Rio Treaty was also a Cold War pact aimed at the Soviet Union.
In practice, the treaty has been largely invoked, in conjunction with the consultative organs of...
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