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.
St. Francisville, Louisiana
At the end of the American Revolutionary War, Great Britain ceded what it called West Florida to Spain in 1783, as part of the Treaty of Paris. There were years of contention as to exactly where the eastern boundary of the 1803 Louisiana Purchase was—depending on which treaty was cited, as France, Great Britain, and Spain had redrawn the boundaries among themselves during the second half of the 18th century. Spain continued to claim territory on the eastern side of the Mississippi River until it and the United States settled this issue in the Pinckney Treaty. This region is today called the Florida Parishes.