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Was a joint attack on the Republic of Poland by Nazi Germany. This trigered world war 2, with Britain and France declaring war on Germany. This started a devastating world effect.
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A bombing campaign was conducted by Nazi Germany against London and other British cities. It was meant to demoralize the British population. It was also to destroy their war materials so they had to surrender.
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This was a major turning point in WW2; it ended a series of German advances. It forced Nazi Germany into a defensive war.