"Finally recognized on the world stage! Time to show them the true magnificence of Siam! #UNBound #Thailand #MovingOnUp" - King Prajadhipok of Siam
Dec 12, 1946 - United Nations Security Council Resolution 13 relating to acceptance of Siam (now Thailand) to the United Nations is adopted.
https://en.wikipedia.org/wiki/United_Nations_Security_Council_Resolution_13
