I think America was reminded tonight during his address:

Yet America has confronted evil before, and we have defeated it--sometimes at the cost of thousands of good men in a single battle. When Franklin Roosevelt vowed to defeat two enemies across two oceans, he could not have foreseen D-Day and Iwo Jima--but he would not have been surprised at the outcome. When Harry Truman promised American support for free peoples resisting Soviet aggression, he could not have foreseen the rise of the Berlin Wall--but he would not have been surprised to see it brought down. Throughout our history, America has seen liberty challenged--and every time, we have seen liberty triumph with sacrifice and determination.