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.
Tombigbee District
The British held West Florida until 1779–81, late in the American Revolutionary War, when it was captured by Spanish forces under the command of Bernardo de Gálvez. It formally became a Spanish possession with the 1783 Treaty of Paris, which also ended the American Revolution. This caused a boundary dispute between the United States (US) and Spain, with the U.S. claiming that the boundary between its territory and West Florida was at the 31st parallel north and Spain claiming it at 32 degrees 28 minutes of north latitude. Spain held the Tombigbee settlements until the Pinckney's Treaty in 1795, in which they agreed to the boundary at the 31st parallel north in return for other concessions by the US. It was ratified in the United States Senate on March 7, 1796 and by Spain on April 25, 1796, being proclaimed on August 3, 1796. The treaty stipulated that both countries would participate in a joint expedition to mark the agreed-upon boundary; President George Washington selected Andrew Ellicott as commissioner. The survey was completed in early 1800, although American settlers had already been pouring into the area since the proclamation of the treaty.