The reason why I asked that last question of Mott, is because there is a difference between the American Revolution (1763-1791) and the War of Independence (1775-1783). 1763 marked not only the end of the French & Indian War and the passage of the Proclamation in an attempt to prevent further conflict, but it also marked the end of Salutary Neglect.
As such, the ideals of the American Revolution had largely been established for a long time. The first example of republican government dating back the 1619 (House of Burgesses), of religious freedom when the Pilgrims arrived from England, and let's not forget that Jamestown, the first settlement, was founded by a corporation, along with the the Carolina colonies later on.
The watershed moment really came in 1688, during the Glorious Revolution. King James II had temporarily ended Salutary Neglect and was trying to force all of the colonies onto Royal Charters. The colonists enacted their own Glorious Revolution, driving the deposed king's officers out of power, and were actually rebuked by Parliament for this. And from the 1688 revolution, England got a Constitutional Monarchy, and from the principles of moderation and common law, all Englishmen secured an unwritten Constitution, based upon common law.
The American Founding Fathers considered themselves Englishmen, and cherished constitutionalism. They argued not against monarchy, but against tyranny, and for their constitutional rights. They concluded, during the debate with Parliament, that monarchy was unsuited to upholding their interests, and thus leaned toward establishing a republic when they broke away. They first symbolized their break, not through the Declaration, but through having each colony draft its own constitution, and Adams convinced them to do this by arguing that the entire crisis could be blamed on having an unwritten constitution, that could be interpretated out of existence by tyrants.
The Founders realized that their Revolution was the product of nearly two centuries of experience and philosophical and political development. This is why they would argue, suddenly, that the French Revolution which came so soon afterward was so radical that it should not be openly and directly supported. Furthermore, the most crucial region in all of this, New England, was the most conservative bastion of the entire North American Colonies, without which, there would have been no revolution.