Which two organizations were formed to defend against possible communist aggression

North Atlantic Treaty Organization (NATO), 1949. The North Atlantic Treaty Organization was created in 1949 by the United States, Canada, and several Western European nations to provide collective security against the Soviet Union.

The two organization that were formed to defend against possible communist aggression are NATO (North Atlantic Treaty Organization) and the SEATO (South East Asia Treaty Organization.)  These organizations was formed after the World War II, after the communist reign of Adolf Hitler.

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