Likewise, the surrender of Cornwallis in October 1781 didn't mark the end of the war. There were still British troops in the colonies and the last of them didn't leave until the evacuation of New York November 1783.
By 1778 the "American Revolution" had been subsumed in the general conflict between Britain and France which didn't end until after the Battle of Waterloo in 1815, over 40 years later. The British evacuation of New York didn't mark the end of the global war between Britain and France anymore that the US evacuation of Saigon in 1975 marked marked the end of the cold war.
We meant well to the Americans - just to punish them with a few bloody noses and then make laws for the happiness of both countries was George IIIs view it, and the title of an excellent, if somewhat flawed, book on the Revolution, by Robert Harvey. It gives a British apology for the events leading up to the Revolution and during the war, and the way the campaign was conducted. We do not often hear these arguments on this side of the Atlantic.