Florida Territory
Beginning in late 1835, Osceola and the Seminole allies began a guerrilla war against the U.S. forces. Numerous generals fought and failed, succumbing to the heat and disease as well as lack of knowledge of the land. It was not until General Thomas Jesup captured many of the key Seminole chiefs, including Osceola who died in captivity of illness, that the battles began to die down. The Seminoles were eventually forced to migrate. Florida joined the Union as the 27th state on March 3, 1845. By this time, almost all of the Seminoles were gone, except for a small group living in the Everglades.
Spanish Florida
After American independence, the lack of specified boundaries led to a border dispute with the newly formed United States, known as the West Florida Controversy. The two 1783 treaties that ended the American Revolutionary War had differences in boundaries. The Treaty of Paris between Britain and the United States specified the boundary between West Florida and the newly independent U.S. at 31°. However, in the companion Peace of Paris between Britain and Spain, West Florida was ceded to Spain without its boundaries being specified. The Spanish government assumed that the boundary was the same as in the 1763 agreement by which they had first given their territory in Florida to Britain, claiming that the northern boundary of West Florida was at the 32° 22′ boundary established by Britain in 1764 after the Seven Years' War. The British line at 32° 22′ was close to Spain's old claim of 32° 30′, which can be justified by referring to the principle of actual possession adopted by Spain and England in the 1670 Treaty of Madrid. The now independent United States insisted that the boundary was at 31°, as specified in its Treaty of Paris with Britain.