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The 1939 invasion of Poland caused Britain to declare war on Germany, which started WWII.
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The specific reason was that German forces invaded Belgium on their way to France. Britain, France and Prussia (the key forerunner of Germany) had guaranteed Belgian neutrality in 1839 (and again in 1875). Moreover, Britain was an ally of France and was not willing to let a substantial part of the coast opposite Britain fall into unfriendly hands.
France, Spain, Great Britain, and the United States of America
When Germany invaded Poland, France and England declared war on Germany, this started WWll