Which was accomplished by the adams-onis treaty

The Adams–Onís Treaty 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.

America gained all of florida from the spanish and in turn eliminated the threat of an attack by the spanish

And this too use this if needed