<P> In the 1762 Treaty of Fontainebleau , France ceded Louisiana west of the Mississippi River to Spain , its ally in the war , as compensation for the loss of Spanish Florida to Britain . Even after France had lost its claim to Louisiana , settlement of Upper Louisiana by French - speakers continued for the next four decades . French explorers and frontiersmen , such as Pedro Vial , were often employed as guides and interpreters by the Spanish and later by the Americans . The Spanish lieutenant governors at St. Louis maintained the traditional `` Illinois Country '' nomenclature , using titles such as `` commander in chief of the western part and districts of Illinois '' and administrators commonly referred to their capital St. Louis `` of the Ylinuses '' . </P>
<P> In the 1762 Treaty of Fontainebleau , France ceded Louisiana west of the Mississippi River to Spain , its ally in the war , as compensation for the loss of Spanish Florida to Britain . Even after France had lost its claim to Louisiana , settlement of Upper Louisiana by French - speakers continued for the next four decades . French explorers and frontiersmen , such as Pedro Vial , were often employed as guides and interpreters by the Spanish and later by the Americans . The Spanish lieutenant governors at St. Louis maintained the traditional `` Illinois Country '' nomenclature , using titles such as `` commander in chief of the western part and districts of Illinois '' and administrators commonly referred to their capital St. Louis `` of the Ylinuses '' . </P>
who did france transfer the louisiana territory to after the french and indian war
who did france transfer the louisiana territory to after the french and indian war
Spain
Spain