The Cause of World War II

Why was the world plunged into WWII in 1939, what is the most effective response to aggression, appeasement, or collective security?
The 1920s began with a favorable outlook for peace, however towards the end of the decade, clouds of war began to form. Aggressors began to take charge and strong feelings of nationalism arose. Fascist leaders such as Benito Mussolini of Italy and Adolf Hitler of Germany also helped lead Europe into the outbreak of a war and into a new era.
Intimidation from Fascist leaders was a factor that led to the illogical events of World War II. Adolf Hitler, chanc…