Respuesta :
I know that the UK, Soviet Union, Asia were all involved. I hope that helps.
The following countries remained neutral during WWII but most however became occupied therefor making them impacted.
- Andorra (Occupied by France and Spain)
- Ireland (Occupied by Great Britain)
- Portugal (Unoccupied)
- Spain (Unoccupied)
- Sweden (Unoccupied)
- Switzerland (Unoccupied)
- Liechtenstein (Occupied by The USSR)
- Vatican "The Holy See" (Occupied by Italy)