New France
In 1763, France had ceded the rest of New France, except the islands of Saint Pierre and Miquelon, to Great Britain and Spain at the Treaty of Paris, which ended the Seven Years' War (known as the French and Indian War in North America and especially the United States). Britain received Canada, Acadia, and the parts of French Louisiana which lay east of the Mississippi Riverexcept for the Île d'Orléans, which was granted to Spain, along with the territory to the westthe larger portion of Louisiana.
History of New Orleans
In 1763 following Britain's victory in the Seven Years' War, the French colony west of the Mississippi River—plus New Orleans—was ceded to the Spanish Empire as a secret provision of the 1762 Treaty of Fontainebleau, confirmed the following year in the Treaty of Paris. This was to compensate Spain for the loss of Florida to the British, who also took the remainder of the formerly French territory east of the River.