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The September 1, 1939, invasion of Poland by Nazi Germany, followed by the Soviet invasion on September 17, is primarily significant for triggering World War II in Europe. -
They transformed a regional conflict (the invasion of Poland) into the global conflict of World War II, officially ending the policy of appeasement and triggering pre-existing alliance obligations. -
It took only six weeks to defeat Allied forces using Blitzkrieg tactics, bypassing the Maginot Line.