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The invasion of Poland was significant because it started World War II when Britain and France declared war on Germany. -
It was significant to World War II because Great Britain and France declaring war turned the conflict into a full-scale world war. -
The Battle and Great Escape at Dunkirk was significant because it allowed hundreds of thousands of Allied soldiers to escape and continue fighting instead of being captured. -
The invasion of Belgium, Luxembourg, the Netherlands, and France was significant because it allowed Nazi Germany to quickly defeat France and expand the war across Western Europe.