Question

what is main cause for world war 2

Answer 1

I think main cause is Germay invade poland which.lead to w0rld war 2

Answer 2

long-term causes of World War IIappear in the conditions preceding  World War I  historians may see these as common causes for both World Wars. Supporters of this view   Carl von Clausewitz, seeing World War II as a continuation of World War I by the same means. In fact, World Wars had been expected before  Benito Mussoliniand 
Adolf Hitler came to power and Japan invaded China