Louisiana's first inhabitants were American Indians of the Atakapa, Opelousa, Coushata, Chitimacha, Houma, Tunica, Natchez, and Koroa people....The French-Canadian explorer René Robert Cavelier, Sieur de la Salle in 1682 erected a cross at the mouth of the Mississippi River after descending the river from the Great Lakes. He named the region after Louis XIV, and claimed it for France....In 1718 New Orleans was founded and named after Phillippe Duc d'Orleans. The St Louis Cathedral was built in the same year, and in 1723 New Orleans became the capital of the French colony of Louisiana. Sugar cane was introduced during the 1750s and an early plantation system established, with large numbers of Africans arriving in the state to work as slaves....Cotton and sugar dominated agriculture in the 19th century, and New Orleans was one of the USA's leading ports, serving as the outlet for the Cotton Belt. Louisiana seceded from the Union in 1861 and, after a brief period as a republic, joined the Confederacy....In 1824 the state adopted a Civil Code based on French Napoleonic and Roman models, which is unique in the USA. Baton Rouge became the state capital in 1849....The state's nickname is a tribute to the official state bird, the brown pelican, which is native to Louisiana....The state is associated with the development of jazz and blues; the music industry contributes to the economy and is a major tourist attraction.