Maritime history of Florida
Spain ceded Florida to the United States as part of the Adams–Onís Treaty of 1819, and Florida became a U.S. territory in 1821. Coastal trade with other markets continued to expand and towns like Jacksonville, Pensacola and Tampa became important ports. After becoming a U.S. territory, the federal government began building a series of lighthouses as aids to navigation along the coasts of Florida to mark dangerous headlands, shoals, bars and reefs.
East Coast of the United States
Two additional U.S. states on the East Coast were not among the original thirteen colonies: Maine (became part of the English colony of Massachusetts in 1677) and Florida (part of New Spain until 1821, though held by the British from after the end of the French and Indian War until 1781).