The causes of the Second World War are as follows:
- Failure of the league of nations
- Europe isolation because of American's isolation
- Unemployment
- Economic crisis
- Germany and Italy broke the Paris peace treaty
- Threat of communism
- Birth of the totalitarians and free attacks
- Birth of stern nationalism and extremist parties
- Political cause
- The Spanish civil war
- A prelude to the war
- Rome-Berlin-Tokyo Axis