Treaty of Versailles :
German colonies were divided among the victorious powers and Germany was forced to pay a huge amount as war indemnity. Hitler was against this and protested strongly which led to an outbreak of war.
Growth of Fascism & Nazism :
The fascism in Italy and Nazism in Germany were the root cause of 2nd World War. The competition between imperialist nations be¬came severe. Britain France and Holland captured majority of the colonies and markets in Asia & Africa. Germany, Italy & Japan had no colonies. This made them in misery. They planned to capture colonies and conquer the weakest nations.