World War II
September 1, 1939, marks the date when Germany invaded Poland, initiating World War II. This act of aggression by Adolf Hitler and the Nazi regime was significant as it shattered the fragile peace in Europe and triggered a series of declarations of war by major powers, leading to a global conflict. The invasion was facilitated by the swift and brutal tactics of Blitzkrieg, showcasing Germany's military might and strategy, and highlighting the failure of diplomatic efforts to contain Nazi expansionism.
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