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UK Declaring War on GermanyGreat Britain and Poland had a mutual aid treaty that required either country to come to the aid of the other in the event of war. When Germany invaded Poland, Britain (and the Commonwealth) was obligated to come to the aid of Poland by declaring war on Germany.

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  • Germany kept breaking the Treaty of Versailles that ended WW1. Finally when Germany invaded Poland, England had no choice but to declare war. Appeasement by Neville Chamberlain had failed and only encouraged Germany and Hitler, so England knew that Hitler was bent on domination of Europe. England could not allow this to happen.
  • Because Germany invaded Poland. Britain had earlier guaranteed Poland's independence and as a result of German's invasion of Poland, declared war on Germany.
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