I'd say about 85%
Germany had was the one country that was involved in World War l and World War ll
Hitler's country, which was actually Austria, got involved in World War 2 in 1939, the year the war started.
Before world war 2, Spain was involved in a civil war.
poland
Ethiopia and four small Spanish colonies in Africa were not involved in World War 1. World War 1 affected every country in some way or another, even if the country was not involved in the war.
Yes, every country was involved with the world wars. That is why they are called world wars.
To get a peace from all country during world war 1
it was a neatual country
104
Japan
World War I World War II Afganistan War(After 2001) Plus many small wars in its country
The name 'World War' suggests, as indeed was the case, that most of the world was involved.