21 years.
NO it wasnt that long it was about 10-15 years when world war 2 started AFTER world on 1 . :)
21 years.
Switzerland has a long history of neutrality.
6 years and 1 day
World War I ended in 1917 and World War II began in 1939 - there was 21 years in between them.
1 hour
2 years
In world war 1,germany started the war,but in world war 2,japan started it and usa ended the war
6 years and 1 day
World War 2
World War 1: The UK, and Japan. World War 2: The UK, and Russia.
World war 2