Answer:
according to Treaty of Paris (1783) - Wikipedia
The Treaty of Paris gave Britain the east side of the Mississippi (including Baton Rouge, Louisiana, which was to be part of the British territory of West Florida). New Orleans, on the east side, remained in French hands (albeit temporarily).
The Treaty of Paris (1783) had stipulated that the Mississippi would be the western boundary of the United States and that it would be open to Americans for navigation. When Spain closed the river to Americans in 1784, Southerners were bellicose and threatened war.
Both Great Britain and the United States are to be given perpetual access to the Mississippi River; Territories captured by either side subsequent to the treaty will be returned without compensation; Ratification of the treaty is to occur within six months from its signing.
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