Barack Obama: “Tonight I am announcing that the American combat mission in Iraq has ended.”

They're meant to remind us of who we can be, to remind us of what's possible, so we can forge ahead.

The success of this experiment was never a given.

That's what I hope every visitor to this center takes away from their experience.

I think when you understand the complexities of America and the contradictions of America, I don’t think it makes you love it less. I think it makes you love it more.