When planning the world order after WW II, United Stated was faced with the problem of how to balance the relationship between universal security regime and regional group. In 1945, the San Francisco Conference adopted the Article 51 of United Nations Charter which centered on the ＂right of collective de- fense＂. This article opened the way for establishment of regional group by U. S.. After signing the Inter - A- merican Treaty of Reciprocal Assistance in 1947, United States and Latin American countries formally estab- lished the first postw...
