美國打韓戰的起因及為何結束.

韓戰的起因﹖那是一個很複雜的問題，那要由在這場戰爭之前的韓國歷史講起。
朝鮮半島在1910年之前是一個獨立的國家。從1910年開始，日本對它進行殖民統治。由於日本人的管治很差，所以有很多反日並追求朝鮮獨立的遊擊隊出現，其中較突出的領袖有金日成和李承晚。
朝鮮獨立運動在二戰末期出現曙光。因為日本在全世界夾攻之下開始崩潰，它對朝鮮的控制自然減弱，後來日本投降，蘇聯趁進攻中國東北的時機支持金日成佔領朝鮮半島北部，而美國則支持李承晚佔領朝鮮半島南部，雙方以北緯38度線為界，於是朝鮮半島就這樣分成南北兩半。
無論金日成還是李承晚都想統一全個朝鮮半島，雙方都認為自己的政府才是正宗，所以其實無論南、北韓都有想過發動統一戰爭。不過，金日成在蘇聯的支持下便先下手為強突然侵入南韓，美韓聯軍差點被殲，但後美國參戰後北韓又差點被滅，然而這時中國又突然參戰幫助北韓，把美軍趕過38線，之後雙方從1951年開始便僵持在38線上。直至1953年，雙方才簽訂停戰協議，但仍未正式簽署和約，這即是說，南北韓現在於理論上仍處於交戰狀態，只不過是暫時停戰而已，不過有傳聞說雙方想正式簽訂和約。

Steven first two paragraphs are good, but the third one do not anwer much.

金日成 attack the South Korea first on 25thJune, 1950. At first, his army captured Sourl in 3 days. At the same time, USA suggest to help South Korean in the United Nation. During the votes in United Nation, United Nation passed the suggest and formed an Army to help South Korea, but this troops mainly were American and they cannot passed the 38th parallel.Although the United Nation help, they south Korea still losing the battle and left the only city, 釜山. on 8th June, generalDouglas MacArthur (麥克阿瑟) meet in Tokyo with other officer and talk about his plane-- the landing of Incheon (仁川登陸). after the landing the United Nation Force captured Sourl fast and push back to the 38th parallel. over here, the Force should be stopped over here, but MacArthur still want to push into the North Korea. Under the USA president, Truman, permision, the United Forced push the North Korean Amry to YaLi river (鴨綠江）. At the same time, the Chinese army which called 中國人民志願軍. After the chinese help the North Korea, the United Nation force lost and retreat back to 38th parallel. During this time,MacArthur want the America used the nuclear weapon on china to win the war, but the Truman wont accept and changed another General. At last, both side wont want to war, so they sign the apeacement and the 38th parallel separate the North and South Korea.

hope i can help u