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.
Territories of the United States on stamps
Florida celebrated its 100th anniversary of statehood by a 3-cent stamp on March 3, 1945. The center of the stamp features the original state seal. The gates of St. Augustine are pictured on the left and the State Capitol in Tallahassee on the right.