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Although many of the nations that would be known as the Allies during WW2 had established pacts should war with Germany become inevitable, they did not jointly declare war at the onset of hostilities.

Poland declared war on Germany immediately following the invasion of their territory by German units at midnight on August 31/September 1st, 1939. The United Kingdom, France, India, Australia & New Zealand declared war against Germany officially on September 3, 1939, creating an allied coalition with Poland. On September 10, 1939, Canada & the Netherlands declared war and joined the coalition.

Additional countries joined the allies, including China on December 9, 1941 and the United States on December 11, 1941.

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Q: What action by the German caused the allies to declare war?
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