Maritime history of Florida
Spain ceded Florida to the United States as part of the Adams–Onís Treaty of 1819, and Florida became a U.S. territory in 1821. Coastal trade with other markets continued to expand and towns like Jacksonville, Pensacola and Tampa became important ports. After becoming a U.S. territory, the federal government began building a series of lighthouses as aids to navigation along the coasts of Florida to mark dangerous headlands, shoals, bars and reefs.
Indigenous people of the Everglades region
In 1817, Andrew Jackson invaded Florida to hasten its annexation to the United States in what became the First Seminole War. After Florida became a U.S. territory and settlement increased, conflicts between colonists and Seminoles became more frequent. The Second Seminole War (1835–1842) resulted in almost 4,000 Seminoles in Florida being displaced or killed. The Seminole Wars pushed the Indians farther south and into the Everglades. Those who did not find refuge in the Everglades were relocated to Oklahoma Indian territory under Indian Removal.