Barack Obama: “That's what is at stake in this election.”

helped lead some of the most significant movements for change in human history

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

There’s no doubt that we are going through a period right now of disruption, polarization.

Of course, we did not accomplish everything we set out to do. No administration does. Some of the exhibits reflect unfinished business, in some cases, my own shortcomings and mistakes, in some cases because - as a sign I kept on the…