In contrast to the wars that followed it — Korea and Vietnam, primarily World War II is said to have had a clear purpose: the smashing of Nazism and fascism and all the horrible things for which they stood. Causes of Second World War(1939-1945) (1) Humiliation by the Treaty of Versailles. Polish corridor was given to Poland. World War II is often viewed as the last good war. The provision for disarming Germany. War indemnity.
Saar coal mine to France for 15 years. City of Danzing was made free. Mussolini (Italy) and Hitler (Germany) strongly glorified war and violence.
(2) Growth of Fascism and Nazism.