Marengo County was created in February 1818, from lands acquired from the Choctaw Indians. A year earlier, a group of French immigrants started growing crops near what is now Demopolis. The Black Warrior and Tombigbee Rivers, which merge at Demopolis, contributed to the town’s prominence in the Black Belt cotton economy. That wealth built many notable homes, including Gaineswood, Bluff Hall, and Lyon Hall. The Demopolis historic district includes the Marengo County History and Archive Museum. The old Marengo County Courthouse in Linden, the county seat, was built in 1850. Chickasaw State Park, near Linden, is a stop on the Black Belt Birding Trail.