The invasions of Poland, the Winter War, the sinking of the Graf Spee, the "phony war" and Norwegian Campaign, and the elevation of Winston Churchill to Prime Minister.
The rise of the Japanese Empire, the Sino-Japanese War, the Soviet-Japanese border conflicts, Pearl Harbor, and the early Japanese successes in the Battle of Malaya and Battle of Singapore.
The opposition to the United States' entry into the war, Lend Lease, U-boat attacks on Atlantic convoys and American responses, mobilization of America after Pearl Harbor, loss of the Philippines, Doolittle Raid, Midway and Guadalcanal.
The desert war, starting with Italy's invasion of Egypt and the attacks and counterattacks between Germany and Italy and the Commonwealth forces, the Axis defeat at El Alamein.