The real turning point were the French and Indian Wars (which was the first real World War) during which the Colonials saw just how badly the British used them, then demanded that they (the Colonists) pay for the war. The colonials were of the opinion that through their citizenship and payment of taxes and blood, they had payed for the war.
From The Treaty of Paris (1763) the revolution was a foregone conclusion, becoming only a matter of when.
Thanks for the clarification.