The Transcontinental Treaty and American Expansion
https://teachingamericanhistory.org/document/the-transcontinental-treaty-and-american-expansion/
WebNext, to rectify the boundary with colonial Spain, which was accomplished in the Transcontinental, or Adams-Onis, Treaty of 1819 (eventually ratified in 1821). In this agreement, the United States gained title to Florida, a long-standing goal, and to Spain’s western territories above California.
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