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.
History of Pensacola, Florida
After the transfer of the vast Louisiana Territory from Spain to France at the end of the 18th century, and the subsequent purchase of the region by the United States in 1803, Spanish East and West Florida were surrounded by American Southern states and territories. Anglo-American settlement of West Florida increased and the Spanish, busy with growing rebellions throughout Mexico and South America, were not able to focus on fortifying the region. In 1810, American settlers in the part of Florida west of the Pearl River (today the boundary between Louisiana and Mississippi) declared the West Florida Republic a state independent from Spain. The region was annexed into the new state of Louisiana in 1812.