There is no way for America to win another war in Korea. Totally different from Iraq and Yugoslavia, North Korea is the fourth ICBM power just after the US, Russia and China. North Korea is the only country in the world to avow a military readiness to work havoc on the American mainland. North Korea has the military capability to fight a nuclear duel with the superpower US and leave New York, Washington, Chicago and Los Angeles in smoking ruins. To be blunt, the DPRK is in a position to bomb Japan and South Korea to a Stone Age backwardness at short notice.
History is a compelling standard.
Not the North Koreans but the Americans backed down each time. The fourth round was a nuclear confrontation. North Korea has the sovereign right to test fire its missiles and reserves the right to conduct missile firing near the American mainland as the Americans do near Korea. One flew 500km and landed in the Sea of Japan and the other two flew over Japan. One hit the specified target area in the high seas off Hawaii and the other near Guam.