History of Florida
In 1810, parts of West Florida were annexed by proclamation of President James Madison, who claimed the region as part of the Louisiana Purchase. These parts were incorporated into the newly formed Territory of Orleans. The U.S. annexed the Mobile District of West Florida to the Mississippi Territory in 1812. Spain continued to dispute the area, though the United States gradually increased the area it occupied.Seminole Indians based in East Florida had been raiding Georgia settlements, and runaway American slaves were their allies; Negro Fort, an abandoned British fortification in the far west of the territory, was manned by both Indians and blacks. The United States Army would lead increasingly frequent incursions into Spanish territory, including the 1817–1818 campaign against the Seminole Indians by Andrew Jackson that became known later as the First Seminole War. The United States now effectively controlled East Florida. Control was necessary, according to Secretary of State John Quincy Adams, because Florida had become "a derelict open to the occupancy of every enemy, civilized or savage, of the United States, and serving no other earthly purpose than as a post of annoyance to them." Florida had become a burden to Spain, which could not afford to send settlers or garrisons. Madrid therefore decided to cede the territory to the United States through the Adams–Onís Treaty, which took effect in 1821.
History of slavery in Florida
American settlers began to establish cotton plantations in northern Florida, which required numerous laborers, which they supplied by buying slaves in the domestic market. On March 3, 1845, Florida became a slave state of the United States of America. Almost half the state's population were enslaved African Americans working on large cotton and sugar plantations, between the Apalachicola and Suwannee rivers in the north central part of the state. Like the people who owned them, many slaves had come from the coastal areas of Georgia and the Carolinas. They were part of the Gullah-Gee Chee culture of the South Carolina Lowcountry. Others were enslaved African Americans from the Upper South who had been sold to traders taking slaves to the Deep South. By 1860, Florida had 140,424 people, of whom 44% were enslaved and fewer than 1,000 free people of color. Their labor accounted for 85 percent of the state's cotton production. The 1860 Census also indicated that in central Leon County (Tallahassee), which was the center both of the Florida slave trade and of Florida’s plantation industry (see Plantations of Leon County), slaves constituted 73% of the population. As elsewhere, their value was greater than all the land of the county. (References in History of Tallahassee, Florida#History of black Tallahassee.)