The departure of American and Soviet troops from Korea in 1949.•When the American troops and the Soviet troops both left Korea they each left behind a ruler and a military based on their beliefs. The military the Americans left behind were anticommunist and rather small. Whereas the Soviet troops left a heavily communist military that was readily armed for battle .North Korea attacks: June 24, 1950 •North Korea invaded the southern border and invaded the western civilization influenced Korea. This day also embarked the United States involvement to help defeat the North. Truman’s response to the Korean invasion: June 25-30, 1950•June 27 is the day President Truman requested to the United Nations to help intervene. Since the Soviet Union was boycotting the Council the United States gained permission an assistance to help defeat the North. The decision to invade North Korea. American decision to invade North Korea and carry the ground war beyond the 38th Parallel toward the Chinese border was inconsistent with the political realities of September 1950. I suggest, the American leadership had different notions of the "kind of war" that unexpectedly presented itself and of the obtainable political objective in the June-November 1950 period. China joining the Korean War. Because General MacArthur, against the orders of President Truman, pushed the North Korean forces to the Yalu River, which separates China and North Korea. Communist China felt threatened by the act and sent the PLA across the Yalu and routed the...