How far should the outcome of the Korean War be seen as a triumph for the USA? (do mind the sp mistakes my spell check wasn't working!)

How far should the outcome of the Korean War be seen as a triumph for the USA? Before the Korean War ensued America maintained the reputation of a dominatingly, successful and unbeatable superpower, an image that was further enhanced by the fact they emerged victorious after their intervention in WWII. Consequently the inability to win the Korean War and the resulting detriments of the war was disquieting for the US, notably by the fact they …

…understanding that there were many limits to this success, one can conclude the triumph was actually very limited in the light of the fact roll back failed and the fact the war resulted in long term negative effects. America proved to its critics that it was still undoubtedly a principal leader of the world but this affirmation was achieved at a great to itself, and surely for the Americans it cannot count as a success.