The military occupation by the British troops of the former French and Spanish forts on the Gulf coast to the east of New Orleans was a movement of continental as well as of local importance. The twentieth article of the Treaty of Paris, 1763, had ceded to His Britannic Majesty all of the French territory to the east of the Mississippi river, except the port of New Orleans and the delta, and all of the Spanish territory of Florida, which extended westward to the Perdido river.
Howard, C. N.
"The Military Occupation of British West Florida, 1763,"
Florida Historical Quarterly: Vol. 17:
3, Article 4.
Available at: https://stars.library.ucf.edu/fhq/vol17/iss3/4