Final answer:
The rise of totalitarian dictatorships in Europe led to World War II due to their use of military force against other nations, the economic and political instability caused by the Great Depression, and their aggressive policies and ambitions.
Step-by-step explanation:
The rise of totalitarian dictatorships in Europe eventually led to the start of World War II due to several reasons. Firstly, totalitarian dictatorships, such as Nazi Germany and Fascist Italy, used military force against other nations to expand their territories and gain resources. For example, Germany's invasion of Poland in 1939 triggered the war. Secondly, the economic and political instability caused by the Great Depression played a role in the rise of these dictatorships. People who were disillusioned with democracy turned to authoritarian leaders for stability and solutions to their problems. Lastly, the aggressive policies and ambitions of these dictatorships, fueled by their ideologies of nationalism and superiority, generated conflicts and rivalries that eventually led to the outbreak of World War II.