July 18 (Chinese New Year), September 2, 1947, the signing of the Treaty of Rio de Janeiro.

1947, the United States and 18 Latin American countries signed the Inter-American Treaty of Reciprocal Assistance, the Rio Treaty. This treaty the United States since early 1947, began brewing promote, (l $ dj��.��r��) contributed to further intensify planning since the "Truman Doctrine" announced. It is in the investigation the Pood shelter grams Protocol "based on the further development, and more background of the" Cold War ". The main terms of this treaty provides that "the attack on any one of the countries of the Americas will be regarded as offensive to all of American States (OAS), and therefore the State party is under an obligation to take aid measures directly victimized, and through the appropriate institutional mining persuade collective measures. " The treaties listed may take action, including the use of force.
is worth mentioning that the treaty invoked Article 51 of the Charter of the United Nations on the terms of the regional defense rights, this clause happens to be the United States initiative to legalize the Pan-American system. Without this provision in the original motion of the Dumbarton Oaks and Regulations without Security Council authorization, implementation of action shall be taken under regional arrangements or by regional agencies. Check Pute Bailey grams after the adoption of the Protocol, it is clear that this Terms conflict. Therefore, in the San Francisco conference, the United States supported the Latin American countries to oppose this provision. Out a compromise last Fandengbaoti both recognize the supreme authority of the UN Security Council, but also to allow Pan Am system play a role, and finally obtained in the form of Article 51 of the Charter of the United Nations, by armed attack: any Member State of the United Nations, the Security Council previously taken measures necessary to maintain international peace and security, the present Charter shall prohibit the exercise of the inherent right of individual or collective self-defense. The approach taken by the Member States for the exercise of this right of self-defense shall be immediately reported to the Security Council, the Member States to apply such measures shall not affect in any respect the powers and responsibilities in accordance with the present Charter to take at any time it deems necessary actions to maintain or restore international peace and security.
now "Rio" turn a reference to this clause, are in fact the United States dictated.
"Rio" is important because it is the first led by the United States under the Collective Defense Treaty, which set a precedent for the future "NATO" Defense Group. Its scope is not limited to the Latin American countries, originally U.S. draft vague obligation for the United States in the conflict in various regions of the world, most Latin American countries are worried adhere to delineate the scope of which includes Greenland, Aleutian Island, Bermuda and other regions, including large areas of the Western Hemisphere region. In addition, after the "Truman Doctrine" of American States, the leadership of the Communist revolution has also been included in foreign aggression, which is the United States to actively promote one of the purposes of the Treaty.