, First Lady
Imelda Marcos, and US President
Lyndon Johnson conversing at the Manila Conference of SEATO members on the Vietnam War in Manila in October 1966 Despite its name, SEATO mostly included countries located outside of the region but with an interest either in the region or the organization itself. They were
Australia (which administered
Papua New Guinea, until 1975),
France (which had recently relinquished
French Indochina, by 1955),
New Zealand,
Pakistan (which, until 1971, included
East Pakistan, now
Bangladesh), the
Philippines,
Thailand, the
United Kingdom (which administered
Hong Kong,
North Borneo and
Sarawak) and the
United States. The
Philippines and Thailand were the only
Southeast Asian countries that actually participated in the organization. They shared close ties with the United States, particularly the Philippines, and they faced incipient communist insurgencies against their own governments.
Thailand became a member upon the discovery of the newly founded "Thai Autonomous Region" in
Yunnan (the
Xishuangbanna Dai Autonomous Prefecture in
Southwest China) – apparently feeling threatened by potential
Maoist subversion on its land. Other regional countries like
Burma and
Indonesia were far more mindful of domestic internal stability rather than any communist threat, and thus rejected joining it.
Malaya (independence in 1957; including
Singapore between 1963 and 1965) also chose not to participate formally, though it was kept updated with key developments due to its close relationship with the United Kingdom. Following their newly affirmed independence from
French Indochina, the states of
North Vietnam,
South Vietnam,
Cambodia, and
Laos were barred from joining any international military alliance as a result of the
Geneva Agreements, signed on July 21, 1954, which brought an end to the
First Indochina War. However, with the lingering threat coming from communist
North Vietnam and the possibility of the
domino theory with
Indochina turning into a communist frontier, SEATO got these countries under its protection – an act that would be considered to be one of the main justifications for the U.S. involvement in the
Vietnam War. Cambodia, however rejected the protection in 1956. The majority of SEATO members were not located in
Southeast Asia. To Australia and New Zealand, SEATO was seen as a more satisfying organization than
ANZUS – a collective defense organization with the U.S. The United Kingdom and France joined partly due to having long maintained colonies in the region, and partly due to concerns over developments in
Indochina. The U.S., upon perceiving Southeast Asia to be a pivotal frontier for
Cold War geopolitics, saw the establishment of SEATO as essential to its Cold War
containment policy. The membership reflected a mid-1950s combination of anti-communist Western states and such states in Southeast Asia. The United Kingdom, France and the United States, the latter of which joined after the
U.S. Senate ratified the treaty by an 82–1 vote, represented the strongest Western powers.
Canada also considered joining, but decided against it in order to concentrate on its NATO responsibilities with its limited defense capabilities.
Budget Average of contributions to civil and military budgets between 1958 and 1973: • United States: 24% • United Kingdom: 16% • France: 13.5% • Australia: 13.5% • Pakistan: 8% • Philippines: 8% • Thailand: 8% • New Zealand: 8%
Secretaries-General Secretaries-General of SEATO: ==Military aspects==