One of the single greatest victories of America is winning the Cold War. I'd even put it ahead of winning WWII.
We won that war because of a relentless opposition to totalitarianism led, primarily, by Republicans who saw it as America's place to control the epidemic enslavement of the human spirit. We did not beat communism because we negotiated nuclear development with the Soviets. We did not put an end to the domino effect by offering aid packages to the East Germans.
We won that conflict, one of the most significant in the history of mankind, because we knew well our obligation to our fellow man to preserve freedom everywhere - and we had the courage act upon it.