Final answer:
The United States acquired Florida from Spain as a result of the Adams-Onís Treaty, concluded in 1819, in exchange for $5 million and renouncing certain territorial claims.
Step-by-step explanation:
As a result of the Adams-Onís Treaty, the United States gained Florida from Spain. This treaty, signed in 1819 between the United States and Spain, not only transferred control of Florida to the U.S. but also defined the boundary between the United States and New Spain. Importantly, as terms of the agreement, the United States paid $5 million to Spain and temporarily renounced its claims to Texas, while Spain gave up Oregon.