Why did the united states get involved in the korean war? in what ways was the war of success and in what ways was the failure?

The are many reasons why the USA got involved in the Korean War. The main reason is because, during that time, Communism had become an opponent for the democratic government. Thus, when North Korea became Communists, they decided to intervene to undermine Communism and protect the American way of life (during this time period, America was very scared of Communism taking over). The other two reasons are a) in fear of the 'domino theory' (do look it up) and they were in competition for world domination with (at the time) the USSR.