Without any doubt whatsoever, The Law of Nature is Jesus Christ, The image of the invisible God(Yahweh, the God of Israel). The Founding Fathers made this very clear before they made the Declaration of Independence. William Livingston(Yale 1741) prepared a Congressional proclamation for a national day of prayer and fasting, which Congress designated May 17, 1776, as the day of its observance. The proclamation declared:
"The Congress...desirous...to have people of all ranks and degrees duly impressed with a solemn sense of God's superintending providence, and of their duty devoutly to rely.... on His aid and direction... do earnestly recommend...a day of humiliation, fasting, and prayer; that we may with united hearts confess and bewail our manifold sins and transgressions and, by a sincere repentance and amendment of life,...and through the Merits and mediation of Jesus Christ, obtain His pardon and forgiveness."
Journals of Congress (1905), Vol. IV, pp. 208-209, May 17, 1776.
The acting President of the Colonies was John Hancock, who was the only signer of the Declaration on July 2. To say that Hancock, and Congress would sign a Declaration affirming a deist, undefined god, when they declared a month and a half earlier their God was Jesus Christ, is deceit!(emphasis added)
To ascribe unalienable rights from an undefined Creator is illogical, and an embarrassment to Jesus Christ, who was given the homage for His merciful Blessings upon the colonies. Because of God's Providence in the American victories at Bennington, Stillwater, Saratoga, and others, Congress drafted and approved a proclamation for a national day of prayer and thanksgiving; this proclamation was approved on November 1, 1777:
"Forasmuch as it is the indispensable duty of all men to adore the superintending providence of Almighty God; to acknowledge with gratitude their obligation to Him for benefits received...[to offer] humble and earnest supplication that it may please God, through the merits of Jesus Christ, mercifully to forgive and blot [our sins] out of remembrance...and to prosper the means of religion for the promotion and enlargement of that kingdom which consisteth "in righteousness, peace, and joy in the Holy Ghost."
Journals of...Congress (1907), Vol. IX, 1777, pp 854-855, November 1, 1777.
As you can see, this proclamation drafted by the same men who signed the Declaration, prayed to Jesus Christ, not to an undefined creator. Did the Founding Fathers apply laws and morality from an undefined creator? Of course not. They knew who their God was, and they studied His Word their entire lives in the schools; the Law of Nature in the Declaration of Independence is Jesus Christ, who is the express image, or exact representation of the God of Israel. That the Christian philosophers from Thomas Aquinas to John Locke agreed, is indisputable. The Christian State Constitutions were drafted by mostly the same men who drafted the Declaration, it is unreasonable to say they would have forgot who their God was. That a few Founding Fathers: Washington, Jefferson, Franklin, and Allen, were in error believing in a universalist god is their problem; ultimately, is irrelevant to the God, religion, law, and morality of the United States, which is based on the Bible.