Don Luis de Onís

Don Luis de Onís was a Spanish diplomat who served as the Minister of Spain to the United States during the early 19th century. He is best known for his role in negotiating the Adams-Onís Treaty, which resulted in the cession of Florida to the United States in 1819. This treaty not only defined the boundaries of Florida but also clarified the western limits of the Louisiana Purchase, significantly impacting U.S. territorial expansion.