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.
Dominion of British West Florida
The Dominion of British West Florida is a separatist micronation founded in 2005 "on an eccentric interpretation of actual historic events" and based in the Gulf coast region of the United States. It claims the territory of the 18th-century colony of West Florida, which has since been subsumed into the US states of Alabama, Louisiana, and Mississippi.