amphibulous
Banned
Indeed. Not to mention the commitment of the French land forces, they did most of the besieging of Yorktown as the American forces had little experience at conducting European style sieges at the time. With the Battle of the Chesapeake (French win) leaving the door open to trap Cornwallis, similar numbers of French regulars as Continental regulars and Rochambeau's central role in directing the siege, Yorktown was really more of a French victory than an American one. Of course that wouldn't fit the creation myth of the United States, so it's promptly ignored for the romanticised version.
Simply put the same thing happened to the British in America as the Americans in Vietnam. Both won the vast majority of their battles, both had issues with geography and getting enough of the local population on their side, both were up against tenacious opponents (Ho Chi Minh idolised Washington incidentally) both could have fought on longer but the wars became too long, too costly, too unpopular and with too little left to gain to make it worthwhile continuing.
Too which you can add the supposedly dull and definitely corrupt Hanoverians were smart enough to turn the odds on the French and the Netherlands - the French ended up bankrupted and London wolfed down more sugar islands and consolidated its lead in India. If Washington had done as well in Iraq, then Iran would be about to go bankrupt and Saudi Arabia would be a US possession. It's easy to think that because the modern world has science and technology that it does *everything* better than our ancestors did - but it's often not true.