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World War II began on September 1, 1939, when Nazi Germany invaded Poland. But the road to war had already been paved by a deal between Hitler and Stalin. The Molotov–Ribbentrop Pact divided Eastern Europe into Nazi Germany’s and the Soviet Union’s spheres of influence – and cleared the way for both regimes to act. Days later, Poland was attacked from the west and, on September 17, from the east by the Soviet Union. On the anniversary of the start of World War II, remember the full story – including the Hitler–Stalin conspiracy that made the war possible.