This country of ours has more wealth than any nation, but that's not what makes us rich. We have the most powerful military on Earth, but that's not what makes us strong. Our universities and our culture are the envy of the world, but that's not what keeps the world coming to our shores.

Instead, it is that American spirit, that American promise, that pushes us forward even when the path is uncertain; that binds us together in spite of our differences; that makes us fix our eye not on what is seen, but what is unseen, that better place around the bend.

That promise is our greatest inheritance. It's a promise I make to my daughters when I tuck them in at night and a promise that you make to yours, a promise that has led immigrants to cross oceans and pioneers to travel west, a promise that led workers to picket lines and women to reach for the ballot. [APPLAUSE]

And it is that promise that, 45 years ago today, brought Americans from every corner of this land to stand together on a mall in Washington, before Lincoln's Memorial, and hear a young preacher from Georgia speak of his dream. [APPLAUSE]

The men and women who gathered there could've heard many things. They could've heard words of anger and discord. They could've been told to succumb to the fear and frustrations of so many dreams deferred.