The main countries that were involved in WWII were Germany, Italy, Japan, United Kingdom, France, Soviet Union, United States, and China. The war was mainly fought in Europe, East Asia, and islands off the Pacific Ocean.
The map above shows a picture of Europe before WWII even began. Shown below is a map of what Europe looked like after WWII.
Darker Green- Allied Powers
Lighter Green- Allies entering after attack on Pearl Harbor
Blue- Axis Powers
Gray- Neutral Powers
Lighter Green- Allies entering after attack on Pearl Harbor
Blue- Axis Powers
Gray- Neutral Powers