In B.E. 2376, King Rama III signed another treaty with the Americans.
Edmund Roberts was sent as a first ambassador from America to Siam by then President Andrew Jackson.
Negotiated with Chao Phaya-Phraklang (Minister of Siam on behalf of the king)
The Siamese-American Treaty of Amity and Commerce (Roberts Treaty of C.E.1833) is still in force but with some modifications even until today.