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.
Treaty of Moultrie Creek
The indigenous peoples of Florida had largely died out by early in the 18th century, and various groups and bands of Muskogean-speakers (commonly called "Creek Indians") and other groups such as Yamasee and Yuchi moved into the area, often with the encouragement of the Spanish colonial government. These groups, which often lived on both sides of the border between Florida and Georgia, came into increasing conflict with white settlers after the United States became independent. When the United States acquired Florida from Spain in 1821 (by means of the Adams-Onís Treaty), the conflict increased. In 1823, the United States government decided to settle the Seminoles on a reservation in the central part of the territory.