The Adams–Onís Treaty of 1819 established the southern and western boundaries of the territory with the Spanish territories of Tejas and Santa Fe de Nuevo México.
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With the Adams–Onís Treaty of 1819, the United States and Spain settled border disputes between the Territory of Missouri and Santa Fé de Nuevo Méjico and Tejas.
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In 1814, during the War of 1812 between the United States and Great Britain, his daughter Mitain (also spelled Mitahne) married Manuel Lisa, recently appointed by the governor of the Missouri Territory as the US Indian agent on the Upper Missouri River.
Samuel Hammond (September 21, 1757 – September 11, 1842) was a lieutenant colonel during the American Revolutionary War, governor and leader in the Louisiana and Missouri Territories, and United States Representative from Georgia in the 8th United States Congress.