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.
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.