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.
History of Alabama
More than a decade later, during the American Revolutionary War, the British informally ceded this West Florida region to Spain. By the Treaty of Versailles, September 3, 1783, Great Britain formally ceded West Florida to Spain. By the Treaty of Paris (1783), signed the same day, Britain ceded to the newly established United States all of this province north of 31°N, thus laying the foundation for a long controversy.
By the Treaty of Madrid in 1795, Spain ceded to the United States the lands east of the Mississippi between 31°N and 32°28'N. Three years later, in 1798, Congress organized this district as the Mississippi Territory. A strip of land 12 or 14 miles wide near the present northern boundary of Alabama and Mississippi was claimed by South Carolina, as part of the eastern colonies' previous hopeful extensions to the west. In 1787, during constitutional negotiations, South Carolina ceded this claim to the federal government. Georgia likewise claimed all the lands between the 31st and 35th parallels from its present western boundary to the Mississippi River, and did not surrender its claim until 1802. Two years later, the boundaries of Mississippi Territory were extended so as to include all of the Georgia cession.