1) The document outlines several key causes that led to the start of WWII, including the Treaty of Versailles, the Great Depression, and the failure of the League of Nations to stop aggression by Germany, Italy, and Japan.
2) It then describes the political and military situations in Germany, Italy, Japan, the Soviet Union, and the US in the late 1930s.
3) The outbreak of war is traced from Germany's invasion of Poland in 1939 to the Japanese attack on Pearl Harbor in 1941, which brought the US fully into the war.