WWII Sides

The Axis

  • German
  • Italy
  • Japan

Slovakia (Nov. 1940)
Hungary (Nov. 1940)
Romania (Nov. 1940)
Bulgaria (March 1941)

The Allies

  • Australia
  • Belgium
  • Brazil
  • Canada
  • China
  • Czechoslovakia
  • Denmark
  • Estonia
  • France
  • Greece
  • India
  • Latvia
  • Lithuania
  • Malta
  • The Netherlands
  • New Zealand
  • Norway
  • Poland
  • South Africa
  • United Kingdom
  • United States
  • USSR
  • Yugoslavia

and others.

(list source)