When we think of the major threats to our national security, the first to come to mind are nuclear proliferation, rogue states and global terrorism. But another kind of threat lurks beyond our shores, one from nature, not humans — an avian flu pandemic.

How does America find its way in this new, global economy? What will our place in history be? Like so much of the American story, once again, we face a choice. Once again, there are those who believe that there isn’t much we can do about this as a nation. That the best idea is to give everyone one big refund on their government—divvy it up by individual portions, in the form of tax breaks, hand it out, and encourage everyone to use their share to go buy their own health care, their own retirement plan, their own child care, their own education, and so on. In Washington, they call this the Ownership Society. But in our past there has been another term for it—Social Darwinism—every man or woman for him or herself. It’s a tempting idea, because it doesn’t require much thought or ingenuity. It allows us to say that those whose health care or tuition may rise faster than they can afford—tough luck. It allows us to say to the Maytag workers who have lost their job—life isn’t fair. It let’s us say to the child who was born into poverty—pull yourself up by your bootstraps. And it is especially tempting because each of us believes we will always be the winner in life’s lottery, that we’re the one who will be the next Donald Trump, or at least we won’t be the chump who Donald Trump says: “You’re fired!” But there is a problem. It won’t work. It ignores our history. It ignores the fact that it’s been government research and investment that made the railways possible and the internet possible. It’s been the creation of a massive middle class, through decent wages and benefits and public schools that allowed us all to prosper. Our economic dependence depended on individual initiative. It depended on a belief in the free market; but it has also depended on our sense of mutual regard for each other, the idea that everybody has a stake in the country, that we’re all in it together and everybody’s got a shot at opportunity. That’s what’s produced our unrivaled political stability.

Today, on this day of possibility, we stand in the shadow of a lanky, raw-boned man with little formal education who once took the stage at Old Main and told the nation that if anyone did not believe the American principles of freedom and equality, that those principles were timeless and all-inclusive, they should go rip that page out of the Declaration of Independence.

In the end, that's what this election is about. Do we participate in a politics of cynicism or a politics of hope? I'm not talking about blind optimism here... No, I'm talking about something more substantial. It's the hope of slaves sitting around a fire singing freedom songs; the hope of immigrants setting out for distant shores; the hope of a young naval lieutenant bravely patrolling the Mekong Delta; the hope of a millworker's son who dares to defy the odds; the hope of a skinny kid with a funny name who believes that America has a place for him, too. Hope in the face of difficulty, hope in the face of uncertainty, the audacity of hope: In the end, that is God's greatest gift to us, the bedrock of this nation, a belief in things not seen, a belief that there are better days ahead.

That is the true genius of America, a faith in the simple dreams of its people, the insistence on small miracles. That we can say what we think, write what we think, without hearing a sudden knock on the door. That we can have an idea and start our own business without paying a bribe or hearing a sudden knock on the door. That we can participate in the political process without fear of retribution, and that our votes will be counted — or at least, most of the time.

When we send our young men and women into harm's way, we have a solemn obligation not to fudge the numbers or shade the truth about why they're going, to care for their families while they're gone, to tend to the soldiers upon their return, and to never ever go to war without enough troops to win the war, secure the peace, and earn the respect of the world.

Tonight, we gather to affirm the greatness of our nation—not because of the height of our skyscrapers, or the power of our military, or the size of our economy. Our pride is based on a very simple premise, summed up in a declaration made over two hundred years ago: "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain inalienable rights, that among these are life, liberty and the pursuit of happiness." That is the true genius of America—a faith in simple dreams, an insistence on small miracles.

My parents shared not only an improbable love, they shared an abiding faith in the possibilities of this nation. They would give me an African name, Barack, or blessed, believing that in a tolerant America your name is no barrier to success. They imagined me going to the best schools in the land, even though they weren't rich, because in a generous America you don't have to be rich to achieve your potential.

There are some who might say that somebody named Barack Obama can’t be elected senator in the state of Illinois. They’re probably the same folks who said that a guy named Rod Blagojevich couldn’t be elected governor of the state of Illinois.