United Nations Security Council Resolution 13 was adopted unanimously on 12 December 1946. The Council recommended that the General Assembly admit Siam as a member state.United Nations Security Council. (1946). Admission of New Members to the United Nations (Resolution No. 13). Retrieved from UN Official Documents.
Prince Wan Waithayakon became the first United Nations ambassador from the country.
See also United Nations Security Council Resolution 6 United Nations Security Council Resolution 8
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