1. Europe: The European theater of World War 2 was one of the most significant, involving fighting in countries such as Poland, France, Germany, Italy, and the United Kingdom.
2. North Africa and the Mediterranean: This region saw battles between the Allied forces and the Axis powers in countries like Egypt, Libya, Tunisia, and Italy.
3. The Eastern Front: The Eastern Front was the site of intense fighting between Nazi Germany and the Soviet Union, stretching from Poland to the Caucasus region.
4. Asia and the Pacific: The Asia-Pacific theater of war encompassed numerous countries and territories, including China, Japan, Burma, India, the Philippines, and many islands in the Pacific Ocean.
5. The Atlantic and Arctic Oceans: The Battle of the Atlantic was fought between Allied and German naval forces, while the Arctic convoys were vital in supplying the Soviet Union with war materials.
6. Middle East: The Middle East was also affected by World War 2, with campaigns taking place in countries such as Iran and Iraq.
7. North America: The United States, while not experiencing direct fighting on its本土, played a crucial role in the war by supplying the Allied forces and serving as a base for military operations.