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.
St. Augustine, Florida
During the Second Spanish period (1784-1821) of Florida, Spain was dealing with invasions of the Iberian peninsula by Napoleon's armies in the Peninsular War, and struggled to maintain a tenuous hold on its territories in the western hemisphere as revolution swept South America. The royal administration of Florida was neglected, as the province had long been regarded as an unprofitable backwater by the Crown. The United States, however, considered Florida vital to its political and military interests as it expanded its territory in North America, and maneuvered by sometimes clandestine means to acquire it. The Adams–Onís Treaty, negotiated in 1819 and ratified in 1821, ceded Florida and St. Augustine, still its capital at the time, to the United States.