Why was New Orleans excluded from the North American territory France ceded to Britain?

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New Orleans was excluded from the North American territory that France ceded to Great Britain in the 1763 Treaty of Paris because France had already secretly agreed to transfer the city and the Louisiana Territory west of the Mississippi River to Spain in 1762.123

This transfer served as compensation to Spain for its losses during the Seven Years’ War, specifically the surrender of Florida to the British in exchange for the return of Havana. Consequently, while France relinquished its claims to lands east of the Mississippi to Britain, New Orleans was effectively removed from the scope of that cession by its prior designation as Spanish territory.123