why did the united states enter the korean war?

Answer 1

We had lots and lots of new military technology gleaned from the Germans after WWII and we needed a place to try it out. Jet fighters and helicopters and new rocket technology and such.

WWII taught us that we are damn good warriors, and there is a lot of money to be made by conducting warfare, and since Korea in 1950, the U.S. has been involved in some kind of military conflict somewhere in the world NON-STOP.

Oh and to stop the spread of communism... at least that's what we told everyone.

Answer 2

North Korea was a communist country and South Korea was not. As usual, we
(the U.S.A.) had to prevent the North from dominating the South, so we sent our troops there to help the South Koreans. The Russians and the Chinese also had troops and planes helping the North Koreans, because they too were Communists. It was not called a war; it was called a "police action" and it lasted from 1950-53. There was never an end to the "war"; we just agreed to a cease fire and there are still about 35,000 U.S. servicemen still
stationed there. The 38th parallel is the agreed
upon Truce Line. The total amount of U.S. servicemen killed or wounded in action may never be known, but I think over 50,000 were killed and more than that were wounded. We still have hundreds unaccounted for who are
now referred to as missing in action. (M.I.A.'s)

Answer 3

To prevent the spread of communism, the domino theory.