The Inter-American Treaty of Reciprocal Assistance, also known as the Rio Treaty, is a mutual defense agreement signed in 1947 by member states of the Organization of American States (OAS). It aims to promote collective security in the Americas, stating that an armed attack against one member is considered an attack against all. The treaty emphasizes cooperation among member countries in addressing threats to peace and security. It has been invoked in various situations, reinforcing the commitment of the Americas to work together in defense of democratic values and regional stability.