What made German Nazism and Italian Fascism such aggressive, even warmongering, ideologies?

What circumstances were conducive to the rise of dictatorships and the decline of democracies between 1918 and 1939, particularly in Italy and Germany? What were three important similarities between Italian fascism and German Nazism. What made German Nazism and Italian Fascism such aggressive, even warmongering, ideologies?

Get a 10% discount on an order above $50
Use the following coupon code :DUE