United States territorial acquisitions
West Florida was declared to be a U.S. possession in 1810 by President James Madison after the territory had declared its independence from Spain. Madison ordered the U.S. Army to take control. Six weeks later, the army entered and occupied the capital, St. Francisville, putting an end to the republic after 74 days of independence. Spain did not relinquish its claim to sovereignty (see West Florida Controversy) until ratification of the Adams–Onís Treaty. General Andrew Jackson personally accepted the delivery of West Florida from its Spanish governor on July 17, 1821.
List of Governors of Florida
Spanish Florida was acquired from Spain in the Adams–Onís Treaty, which took effect July 10, 1821. Parts of West Florida had already been assigned to Alabama, Louisiana, and Mississippi; the remainder and East Florida were governed by a military commissioner with the powers of governor until the territory was organized and incorporated.