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Ditto.Although I suspect the main importance was the American victory at the final battle meant they won the war....
Origin of jazz. The rest is of minor concern.
The strategic importance of New Orleans, as the outlet to the oceans of the entire Mississippi basin, can not be over-stated. If some foreign state had held New Orleans,.......
... Even if the Brits had crushed the US defenders at New Orleans, the Treaty of Ghent's "status quo ante bellum" clause would have made sure the city was returned. After New Orleans, the British captured Fort Bowyer at the mouth of Mobile Bay, and Forts Port Peter and St. Tammany on the Georgia coast. They don't belong to England now, why would one expect New Orleans to be different?
The forts captured were not part of the Louisiana Purchase. Great Britain didn't recognize the legality of the Purchase. Therefore they could argue that New Orleans (and the rest of the Purchase) were not covered by the status quo ante bellum.
The defeat rendered that argument moot. Such is the opinion of the late Robin Reilly in his "The British at the Gates". He was a British historian who lived in New Orleans for a number of years and had a very balanced take on the battle.