The Lower Chiaha comprised the major part of the Seminole tribe, which formed in the eighteenth century in Florida through a process of ethnogenesis. They numbered about 6,000 by the early 19th century. About 2,000 Upper Creek (Red Sticks), who were Creek speakers, joined them after defeat in the Creek War of 1813-1814. Although East and West Florida were under Spanish control, United States forces invaded in 1818 in the First Seminole War, in retaliation for Indian raids against settlers in Georgia.