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Alessandro Barbero - The Second World War The First World War - • Alessandro Barbero - The First World War ... How do wars break out? The Second World War On August 23, 1939, Hitler and Stalin signed a non-aggression pact, and on September 1, Hitler invaded Poland, hoping that the democratic powers, France and England, would not intervene. He was wrong: that day, a war broke out that was to end only six years later and cause destruction on a scale the world had never known. But why had Stalin's negotiations for an alliance with the democratic countries failed, convincing him of the unnatural alliance with Nazi Germany? And what prompted France and England to intervene, when the year before they had passively watched the Nazi invasion of Austria and Czechoslovakia, giving Hitler the feeling that this time too, no one would stop him?