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SEATO was created by the Southeast Asia Collective Defence Treaty, signed in 1954 in Manila, the Philippines, in response to the defeat of France by communist forces in Indochina (Vietnam, Cambodia, and Laos). Under the terms of the treaty, the countries agreed to defend each other against both outside and civil aggression. Economic and social assistance were also included.
SEATO failed to become a powerful organization because many Asian countries refused to join, and because the views of its members diverged regarding the imminence and scale of the threat of communist expansion. After it was phased out, SEATO's nonmilitary aspects were assumed by the Association of Southeast Asian Nations (ASEAN).
Red and white are the traditional colours of South East Asia. The blue canton recalls the British Empire and represents unity. Yellow is the colour of the Sultans of Malaysia. Effective date: 16 September 1963.
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