What Britain might have demanded after victory in 1815

Would Britain have annexed the United States after a decisive victory in 1815?

A dependent state plus British treaty ports would be more plausible than full annexation.

In this counterfactual, a dependent American state is considered more plausible than annexation, which would be difficult to administer. Permanent British possession of selected harbours is suggested as part of the settlement. New York and New Orleans are the main examples, with Charleston a further possibility. The comparison with Hong Kong concerns acquiring ports by treaty as the price of peace. The scenario then raises the question of how British-held ports would affect a later American Civil War.