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This was agreed to in the Adams-Onis Treaty of 1819: in exchange for the "loss" of territory in today's one from 1814 with the "probable southern boundary" and the other most likely from 1819, with the Adams-Onis

But, due to the 1811 Louisiana Constitution, the 1819 Adams Onis Treaty, the Mexican Revolution of 1821

After the signing of the Adams-Onis Treaty of 1819, which legally named the border between New Spain

The presence of the US army after the Adams-Onis Treaty of 1819 (which established the international

United States and Spain after the former's purchase of the Louisiana Territory (often referred to as the Adams-Onis

The area that became Red River County was carved out of Miller County, Arkansas Territory when the Adams-Onis

the straight line to the Sabine River is the Index Line, aka the "boundary of 1819," named after the Adams-Onis

This boundary between New Spain and the United States was established by the Adams-Onis Treaty of 1819

Arkansas Territory was carved from the Missouri Territory by 1819, after the signing of the Adams-Onis

While this questions of legal boundaries would be settled in 1819 with the Adams Onis Treaty , the construction

By 1819, the Adams-Onis treaty settled this dispute, or one should think. ​

According to the 1819 Adams Onis Treaty between the U.S. and Spain, all watersheds that emptied into