Louisiana Louisiana Louisiana (, ) is a state in the Deep South region of the southeastern United States. It is the 31st most extensive and the 25th most populous of the 50 United States. Louisiana is bordered by Arkansas to the north, Mississippi to the east, the Gulf of Mexico to the south, and the state of Texas to the west. A large part of its eastern boundary is demarcated by the Mississippi River. Louisiana is the only U.S. state with political subdivisions termed parishes, which are equivalent to counties. The state's capital is Baton Rouge, and its largest city is
Feliciana Parish, Louisiana of Haiti, in 1803, Napoleon sold Louisiana and its vast territories west of the Mississippi River to the United States in the Louisiana Purchase. The West Florida section of what is now the state of Louisiana, however, was not included; the Louisiana Purchase was vague as to defining its eastern boundary. Though President Jefferson insisted that this area was American, Spain disagreed and continued their occupation. (Since the 1760s, the eastern boundary of West Florida had been the Apalachicola River, and Pensacola was the capital.) Feliciana colonists, unhappy under the Spanish regime, revolted in 1810 and established the short-lived Republic