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.
Florida in the American Civil War
In early May 1865, Edward M. McCook's Union division was assigned to re-establish Federal control and authority in Florida. On May 13, G. W. Scott surrendered the last active Confederate troops in the state to McCook. 
On May 20, General McCook read Lincoln's Emancipation Proclamation during a ceremony in Tallahassee, officially ending slavery in Florida. That same day, his jubilant troopers raised the U.S. flag over the state capitol building. Tallahassee was the penultimate Confederate state capital to rejoin the Union. Austin, Texas rejoined the next month.