After the 2nd world war , the U.S. have influence to Thailand political, economic, and social.
The U.S.A. was with Thailand opposed any return of colonial influence. Thailand must be treated as an enemy-occupied country.
on July 1953, the U.S. National Security Council proposed Thailand as an “anti-communist stronghold” to extend US influence throughout SEA – leading to the USA organised group: SEATO – the Southeast Asia Treaty Organisation.