The three changes to Spanish and American claims in North America by the Adams-Onis Treaty include the following:
B The Spanish surrendered all of Mississippi to the United States.
C The Spanish surrendered all their claims to the Oregon Country.
E The Spanish surrendered all of Florida to the United States.
The Adams-Onis Treaty of 1819 was signed by President John Quincy Adams and Luis de Onís between the United States and Spain. It was a landmark treaty that ensured that Spain surrendered Mississippi, Oregon, and Florida to the United States, while it claimed the Southwestern area.
Thus, the three changes brought by the Adams-Onis Treaty included Options B, C, and E.
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