The Adams-Onis Treaty of 1819 was a treaty between the United States and Spain that gave Florida to the U.S. and set out a boundary between the U.S. and New Spain (now Mexico). It settled a standing border dispute between the two countries and was considered a triumph of American diplomacy. The latter “settlement” was never accepted by American Southerners in general or Louisianans in particular. They later migrated from Louisiana territory and crossed into Spanish Texas, firm in their belief that the original Louisiana Territory included substantial tracts of land as far west as Colorado and New Mexico.
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