- This included battles in Western Europe, Eastern Europe, the Mediterranean, and North Africa.
- Notable campaigns included the Battle of Britain, the invasion of Normandy (D-Day), the Battle of Stalingrad, and the liberation of France.
- The primary opposing forces were the Allies (primarily the United Kingdom, France, the Soviet Union, and the United States) and the Axis powers (Germany, Italy, and their allies).
2. Pacific Theatre:
- This encompassed the battles in the Pacific Ocean, Southeast Asia, and China.
- Key battles included the attack on Pearl Harbor, the Battle of Midway, the Battle of Guadalcanal, and the atomic bombings of Hiroshima and Nagasaki.
- The main adversaries in the Pacific were the United States and its allies (including Australia, China, and the United Kingdom) against the Empire of Japan and its allies.