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
French colonization of Texas Fontainebleau, following its defeat by Great Britain in the Seven Years' War. It ceded New France to Britain. In 1803, three years after Spain had returned Louisiana to France, Napoleon sold the territory to the United States. The original agreement between Spain and France had not explicitly specified the borders of Louisiana, and the descriptions in the documents were ambiguous and contradictory. The United States insisted that its purchase included all of the territory France had claimed, including all of Texas. The dispute was not resolved until the Adams-Onís Treaty of 1819, in which Spain ceded Florida to the United