What we celebrate today is the win for humankind that the United States of America embodies in its founding documents. The ideals and principles that secured liberty and a land of opportunity. Was it perfect? No. Is it perfect now? No. It was and is, however, a grand experiment of We the People governing ourselves.
This unique experiment was not a stab in the dark, but a principled and well thought out assessment of man and government. It rested on 3 main principles contained in the Declaration of Independence. First, there is a God who created all men free with certain unalienable rights of personhood. Second, that there were laws of Nature that governed the world of which were given by Nature’s God. Third, that men must govern themselves if a government based on the rule of law were to succeed. By governing themselves, we mean here that men exercised self-control in governing their own persons as guided by the laws of Nature and of Nature’s God.
While Europe was busy colonizing the rest of the world, the American colonies rebelled and threw off the colonial crown of Great Britain because they were being denied their unalienable rights endowed by their Creator.
“The unanimous Declaration of the thirteen united States of America, When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature’s God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation.
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.
And for the support of this Declaration, with a firm reliance on the protection of divine Providence, we mutually pledge to each other our Lives, our Fortunes and our sacred Honor.”
The Founding Fathers assessed that man was easily corrupted by power and prone to wield that power in ways that jeopardized other’s liberty. They established a separation of powers to check this human flaw to ensure continued liberty and prevent the Tyranny they saw in other forms of government. They established checks and balances between the executive, the legislative, and the judicial branches of government set forth in the U.S Constitution. The purpose is stated below in the beginning of the Constitution.
“We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.”
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
James Maddison summed up these two crown jewels of the Bill of Rights in showing the relationship between the 1st and 4th Amendments.
“A man has a property in his opinions and the free communication of them.
He has a property of peculiar value in his religious opinions, and in the profession and practice dictated by them.
He has a property very dear to him in the safety and liberty of his person.
He has an equal property in the free use of his faculties and free choice of the objects on which to employ them.
In a word, as a man is said to have a right to his property, he may be equally said to have a property in his rights.” James Madison
Abraham Lincoln on the Declaration of Independence – 1858
The evils of slavery do not diminish the principles on which this nation was founded. These grand principles were in fact the basis for abolishing slavery. Abraham Lincoln referenced the founding documents as why slavery must be abolished in a debate with Stephen Douglas where he declares below:
“The Declaration of Independence (said Mr. L.) was formed by the representatives of American liberty from thirteen States of the confederacy—twelve of which were slaveholding communities. We need not discuss the way or the reason of their becoming slaveholding communities. It is sufficient for our purpose that all of them greatly deplored the evil and that they placed a provision in the Constitution which they supposed would gradually remove the disease by cutting off its source. This was the abolition of the slave trade.
So general was conviction—the public determination—to abolish the African slave trade, that the provision which I have referred to as being placed in the Constitution, declared that it should not be abolished prior to the year 1808. A constitutional provision was necessary to prevent the people, through Congress, from putting a stop to the traffic immediately at the close of the war.
Now, if slavery had been a good thing, would the Fathers of the Republic have taken a step calculated to diminish its beneficent influences among themselves, and snatch the boon wholly from their posterity? These communities, by their representatives in old Independence Hall, said to the whole world of men: “We hold these truths to be self evident: that all men are created equal; that they are endowed by their Creator with certain unalienable rights; that among these are life, liberty and the pursuit of happiness.” This was their majestic interpretation of the economy of the Universe. This was their lofty, and wise, and noble understanding of the justice of the Creator to His creatures. [Applause.]
Yes, gentlemen, to all His creatures, to the whole great family of man. In their enlightened belief, nothing stamped with the Divine image and likeness was sent into the world to be trodden on, and degraded, and imbruted by its fellows.
They grasped not only the whole race of man then living, but they reached forward and seized upon the farthest posterity.
They erected a beacon to guide their children and their children’s children, and the countless myriads who should inhabit the earth in other ages.
Wise statesmen as they were, they knew the tendency of prosperity to breed tyrants, and so they established these great self-evident truths, that when in the distant future some man, some faction, some interest, should set up the doctrine that none but rich men, or none but white men, were entitled to life, liberty and the pursuit of happiness, their posterity might look up again to the Declaration of Independence and take courage to renew the battle which their fathers began—so that truth, and justice, and mercy, and all the humane and Christian virtues might not be extinguished from the land; so that no man would hereafter dare to limit and circumscribe the great principles on which the temple of liberty was being built. [Loud cheers.]
Now, my countrymen (Mr. Lincoln continued with great earnestness,) if you have been taught doctrines conflicting with the great landmarks of the Declaration of Independence; if you have listened to suggestions which would take away from its grandeur, and mutilate the fair symmetry of its proportions; if you have been inclined to believe that all men are not created equal in those inalienable rights enumerated by our chart of liberty, let me entreat you to come back. Return to the fountain whose waters spring close by the blood of the Revolution.
Think nothing of me—take no thought for the political fate of any man whomsoever—but come back to the truths that are in the Declaration of Independence. You may do anything with me you choose, if you will but heed these sacred principles. You may not only defeat me for the Senate, but you may take me and put me to death. While pretending no indifference to earthly honors, I do claim to be actuated in this contest by something higher than an anxiety for office. I charge you to drop every paltry and insignificant thought for any man’s success. It is nothing; I am nothing; Judge Douglas is nothing. But do not destroy that immortal emblem of Humanity—the Declaration of American Independence.” 
Katharine Lee Bates – 1913 – from the song America the Beautiful
America! America! God mend thine ev’ry flaw,
Confirm thy soul in self-control,
Thy liberty in law!
O Beautiful for patriot dream
That sees beyond the years
Thine alabaster cities gleam,
Undimmed by human tears!
America! America! God shed His grace on thee,
And crown thy good with brotherhood
From sea to shining sea!
Martin Luther King Jr. 1963 taken from I Have A Dream
“I say to you today, my friends, so even though we face the difficulties of today and tomorrow, I still have a dream. It is a dream deeply rooted in the American dream.
I have a dream that one day this nation will rise up and live out the true meaning of its creed: “We hold these truths to be self-evident: that all men are created equal.”
I have a dream that one day on the red hills of Georgia the sons of former slaves and the sons of former slave owners will be able to sit down together at the table of brotherhood.
I have a dream that one day even the state of Mississippi, a state sweltering with the heat of injustice, sweltering with the heat of oppression, will be transformed into an oasis of freedom and justice.
I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character.
I have a dream today.
I have a dream that one day, down in Alabama, with its vicious racists, with its governor having his lips dripping with the words of interposition and nullification; one day right there in Alabama, little black boys and black girls will be able to join hands with little white boys and white girls as sisters and brothers.
I have a dream today.
I have a dream that one day every valley shall be exalted, every hill and mountain shall be made low, the rough places will be made plain, and the crooked places will be made straight, and the glory of the Lord shall be revealed, and all flesh shall see it together.
This is our hope.”