French Louisiana French Louisiana The term French Louisiana refers to two distinct regions: Each term has been in use for many years. Colonial French Louisiana was a part of New France. Beginning in 1682 this region, known in French as "la Louisiane française", functioned as an administrative district of New France. It extended from the Gulf of Mexico to Vincennes, now in Indiana. France ceded the region to Spain and Britain in 1763 after the French and Indian War, regained it by treaty in 1800, and sold it to the United States in 1803 through the Louisiana Purchase. Greater New Orleans and
France–Spain relations Western Flanders, roughly equivalent to the modern French department of Nord, was also ceded. An anomaly of the treaty was that although all villages in Roussillon were ceded to France, Llívia was deemed to be a city and was therefore retained by Spain to the present day as an exclave into France. The treaty was signed on Pheasant Island, an uninhabited, unserviced island in the Bidasoa river between the French commune of Hendaye and the Spanish municipality of Irun. Both settlements, and therefore their countries, took sovereignty of the island for six months out of each year. After Philip IV