There were two major forces: Allied and Axis
Major Allied Countries:
Great Britain(England only, Ireland was neutral)
Russia or USSR
France(Though France opposed us in the operation Torch landings)
Major Axis Countries:
Japan
Italy
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German, Soviet Union, France, Italy, United Kingdom, Japan, USA
It's in page 563 of your text book!
The navies of the US and Japan .
The primary combatants were the Germans and the British.
Wireless communications were used by most of the combatants during WWII.