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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

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

Land Louisiana, the Missouri Territory, and the Arkansas Territory Theft of the Caddo Homelands The Adams-Onis