23 nations.
many nations were involved in WW I. Hence the name.
About 50 nations fought in WW2 but basically the whole world was involved.
the USSR and the US
Nearly all the major nations were involved in World War 2.
The USSR, and the United States of America.
The United States was one of many nations that were not combatants at the beginning of World War 1.
Almost all of continental Europe was involved in World War 2. Many nations were invaded and occupied by Germany. Germany, France, England, Italy, and Russia were all combatants.
Those nations not involved, were glad they weren't.
It was a World War and few nations and only the Antarctic Continent seemed able to avoid it effects.
Britain and Francee were involved in the Suez War.
The Great War (WWI) was the first of its kind, one that involved many nations.
The Great War (WWI) was the first of its kind, one that involved many nations.