The Southeast Asia Treaty Organization (SEATO) was an alliance organized on September 8, 1954 by representatives of Australia, France, Great Britain, New Zealand, Pakistan, the Philippines, Thailand, and the United States.
Established under Western auspices after the French withdrawal from Indochina, SEATO was created to oppose further Communist gains in Southeast Asia. The treaty was supplemented by a Pacific Charter, affirming the rights of Asian and Pacific peoples to equality and self-determination and setting forth goals of economic, social, and cultural cooperation between the member countries.
The civil and military organizations established under the treaty had their headquarters in Bangkok, Thailand. SEATO relied on the military forces of member nations and joint maneuvers were held annually.