The document discusses President Truman's decision to get the US involved in the Korean War in 1950. It provides background on the significance of the Korean War as the first major conflict of the Cold War outside of Europe and the first real test for the UN. It then lists reasons why Truman decided on military action: to back his Truman Doctrine against communism, prevent further communist expansion per his Domino Theory, and on the advice of General MacArthur who assured victory. The document prompts considering reasons Truman's decision could be seen as a bad idea and profiles key figures in the war.