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Britain with support from France, declared war on Germany on September 3, 1939 after German forces invaded Poland. At the end of World War I, part of the Treaty of Versailles was the understanding that Germany would not increase its military, ally itself with Austria/Hungary, or invade other nations. By September of '39, Germany was well on its way to breaking every agreement made in the Treaty, and England and France - who had overlooked earlier transgressions -reached a point that required they hold to Germany accountable. Declaring war was the last ditch effort to put a stop to their actions.

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6mo ago

Britain declared war on Germany at the start of World War 2 because Germany had invaded Poland on September 1, 1939. As part of a mutual defense pact with Poland, Britain felt compelled to fulfill its commitment to defend Poland's sovereignty. Additionally, Germany's aggressive actions and expansionist ambitions posed a direct threat to Britain and its allies.

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Q: Why Britain declared war on Germany at start of World War 2?
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