Why did Spain and the United States sign a treaty in 1819?

The Adams–Onís Treaty ( Spanish: Tratado de Adams-Onís) of 1819, also known as the Transcontinental Treaty, the Florida Purchase Treaty, or the Florida Treaty, was a treaty between the United States and Spain in 1819 that ceded Florida to the U.S. and defined the boundary between the U.S. and New Spain.

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