to be capable of · to be able to · can

That's the true genius of America; that America can change. Our Union can be perfected. What we've already achieved gives us hope for what we can and must achieve tomorrow.

Nobody can solve this problem.

And this year, in this election, she touched her finger to a screen, and cast her vote; because after 106 years in America, through the best of times and the darkest of hours, she knows how America can change.

America, we have come so far. We have seen so much. But there is so much more to do. So tonight, let us ask ourselves, if our children should live to see the next century, if my daughters should be so lucky to live as long as Ann Nixon Cooper, what change will they see? What progress will we have made?

War isn't something to be done lightly, also changing the constitution isn't something that should be done because "I just really want to go to war".