The Southeast Asia Treaty Organization (SEATO), also known as the Manila Pact, was a treaty organization formed on September 8 1954 by

• the United States,
• the United Kingdom,
• France,
• Australia,
• New Zealand,
• Pakistan,
• Thailand and
• the Philippines.

The organization was headquartered in Bangkok. It was unable to intervene in the conflicts in Laos or Vietnam because such decisions required unanimity, which was never reached: France and the Philippines objected. The official leader of the organization from 1957 was known as the secretary-general. Thai diplomat Pote Sarasin held this position until 1964.

The SEATO was dissolved in 1977.

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