Rio Treaty(redirected from Inter-American Treaty of Reciprocal Assistance)
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Rio Treaty(Inter-American Treaty of Reciprocal Assistance), signed Sept. 2, 1947, and originally ratified by all 21 American republics. Under the treaty, an armed attack or threat of aggression against a signatory nation, whether by a member nation or by some other power, will be considered an attack against all (see Pan-AmericanismPan-Americanism,
movement toward commercial, social, economic, military, and political cooperation among the nations of North, Central, and South America. In the Nineteenth Century
..... Click the link for more information. ). The treaty provides that no member can use force without the unanimous consent of the other signatories, but that other measures against aggressors may be approved by a two-thirds majority. It differs from previous inter-American treaties in that it is a regional treaty within a larger international organization; it recognizes the higher authority of the Security Council of the United Nations.