How did the korean war mark a turning point in the cold war?

The US used political pressure and economic aid to contain communism. Then after the Korean War, the US embarked on a major military buildup. ... This led to an armistice- seize fire- which led to the separate of North and South Korea.

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes