Why did totalitarian leaders gain so much power in Europe and Asia?

A rise in Nationalism in Germany, Italy, Japan, and others, and the great depression

Explanation:

Nationalim led to Italy trying to reclaim the glory of the Roman Empire, led Germany to turn to the nazis, and Japan to unify against China and expand. The depression caused many of the citizens to become poor and some looked to Communism as a way out, and the people against communism supported totalitarianism.

although the legal justifications for the trials and their procedural innovations were controversial at the time, the nuremberg trials are now regarded as a milestone toward the establishment of a permanent international court, and an important precedent for dealing with later instances of genocide and other crimes