Answer:
It showed the role of the USA as the leader of the capitalist-liberal world, shielded by the legislation if the UN, to act in a proxy scenario, that would potentially diminish the prestige of the USSR but without a direct engagement. Thus, the perspectives of the USA people was that the country was in the right side of history.
Step-by-step explanation:
Korea was the first direct showdown of the Cold War, for it was the first proxy war where forces of the US and the USSR engaged in combat, although not as belligerants but as an interest party. It showed that the containment policy had been a failure (most visible with the triumph of the Communist in China) and that a more firm stance against the USSR was needed. But also, it showed that foreign policy would be linked with internal affairs, as taxes were raised, and the beginning of Macartysm was breeded in this context. Communism would be seen as not compatible with the American ethos and left organizations would be targeted, thus entering in a period where the people had a justification to reject anything that could be linked to Communism.