British prime minister Margaret Thatcher famously once said, "Europe was created by history.  America was created by philosophy."  Nearly all European nations trace their beginning to a common ethnic kinship or a cultural characteristic, but America was created by exiles united in voluntary assent to shared political beliefs.  That's why British writer G.K. Chesterton visited the United States for the first time and remarked that America was "a nation with the soul of a church" – not because of its religiosity, but because of a common creed enshrined in "sacred texts" of the Declaration of Independence and Constitution.

In 1776, a near miraculous stew of ideas and leaders came together to form a Declaration of Independence.  Eleven years later, an equally miraculous gathering formed the Constitution.  Both documents centered on a belief in universal human dignity.

Government does not grant you the right to free speech, assembly, religion, press, protest, or redress of grievances.  We believe that these rights are inalienable, and government's role is simply to protect them and ensure human dignity.  Government is just a tool, not a source.  That's really a remarkably profound idea we take for granted and fail to celebrate enough.

The sad irony is that the very Founders who argued these ideas so frequently fell short of those same principles.  Some owned slaves, and nearly all opposed equal rights for women.  So it naturally caused upheaval when nineteenth-century Americans increasingly adopted a view held that "all men are created equal," including black Americans, and a few generations later, it came to encompass women as well.

Abraham Lincoln believed that the Declaration of Independence did not necessarily proclaim people equal in all respects.  Instead, it meant that all people are created with certain equal, inalienable rights, among which are "life, liberty, and the pursuit of happiness."  A free society should always strive to achieve these equal rights, even if, as in the case of the Founders, it fell short of that goal in the past.  The Declaration's concept of equality is an aspiration, Lincoln said, "constantly looked to, constantly labored for, and even, though never perfectly attained, constantly approximated, and thereby constantly spreading and deepening its influence and augmenting the happiness and value of life to all people, of all colors, everywhere."

That is the genius of Lincoln's argument: that the Constitution is concrete (at least until amended), but the Declaration of Independence is aspirational, and the American project is a move toward the aspiration.

Despite its roots in American independence, the 4th of July is incomplete without understanding and celebrating Lincoln, too.  His unique view of the Declaration as an aspiration helped properly frame American independence for what it was and what it was bound to be.