What was the purpose of World War II?

The root cause of the outbreak of World War II, like World War I, is still the inherent contradiction of imperialist countries and the law of unbalanced political and economic development. The direct reason is that the economic crisis of 1929 ~ 1933 accelerated the establishment of the fascist dictatorship of Germany and Japan and the formation of the source of the Eurasian war, and the fascist forces were the makers of the war. In addition, the appeasement policy or neutral self-protection policy adopted by some big countries for their own interests also accelerated the outbreak of war. Although the people of all countries in the world also waged anti-fascist wars, they failed to cooperate and could not stop the outbreak of wars, which led to local wars heading for world wars.