If Comte de Grasse had not won the Battle of the Chesapeake then Admiral Graves would have evacuated Cornwallis' army from Yorktown. While still a significant reverse for the British it would not have been the outright disaster which caused Lord North to realize the war was lost.
The British made so many mistakes by trying to whip up the Indians in the north and servile insurrection in the south they pissed off a large portion of the 'silent majority' and drove them into the rebel camp.
The British made so many mistakes by trying to whip up the Indians in the north and servile insurrection in the south they pissed off a large portion of the 'silent majority' and drove them into the rebel camp.