World War I was the cause for World War II
I believe that world war 1 led to world war 2. the main reason is the treaty of Versailles. the allies totally screwed Germany and were totally unfair.
The allies forbade Germany to have an army of more than 100,000 men, a fleet of more than 36 warships, submarines of any kind, and military air craft. They could not maintain fortifications or military installations within 50km of the Rhine land. And to all that Germany was required to pay large sums of money as reparations for damages that the allies had taken during the war.
The league of nations had the responsibility of keeping the peace, and although they did not admit Germany to the league for the first couple of years after the war, Germany was let in in 1926. The league had little power however, and much of this was that it failed to pass through the American system so America stayed out of the responsibility of keeping the peace in Europe. As further proof to the leagues weakness, an event that occurred in Manchuria that led Japan to attack, was merely overlooked as an ok reason to attack and let Japan get away with it, and to further this, Japan didn’t even care what the league had to say about their little attack.
The rise of Hitler brought its problems also. During the great depression Hitler said that the only way for his country to get out of the depression was to follow Italy’s example and begin to re arm itself. They asked permission from the league but France immediately refused to grant that wish, so Germany said that they would continue as planned with or with out consent, and that same year they left the league of nations. France responded by letting Germany have a standing army of 300,000 men and an air force 50% that of Frances.
Austria had a party modeled after the nazi party and when Austria’s chancellor was assassinated the party attempted a coup detat. However Italian dictator, Benito Mussolini would not stand by and let this happen so he sent Italian troops to the borders in order to stop the takeover.
Mussolini has always want Ethiopia as an economic colony, and they knew that Ethiopia belonged to the league so they could get support from Britain and France, but he also knew that Britain and France were not on good terms and would never agree on anything, so he attacked Ethiopia.
Russia and the rest of the European world were making treaties that would encircle Germany in case of aggression and would clearly bring any power to war if Germany showed any acts of aggression to any of its neighbors. This was called the stressa front, and it angered the Germans into getting prepared for war even more. This made Hitler think that the rest of the European world was against him.
But that proved to be wrong, later on Britain made a deal with him that he could break the versatile treaty by being able to build warships and submarines. Hitler then realized that the countries were not so united after all and in case of war they would surely turn on one another.
these are many reasons on the causes of world war 2 and there are yet many more but I have run out of time so in conclusion I say that the second world war was a sure cause from the first world war.