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Great Brittain had first announced that they would strike Germany back if they would attack Poland.
Germany knew that it was already going to turn out in war anyway, so they took their chances. They invaded Poland.
Offcourse the real situation is more complicated, but this pretty much sums up what happend.
Ans.2: Your question is "when", not "why", so the answer is September 3, 1939.
Wiki User
∙ 12y ago
Wiki User
∙ 15y agoWiki User
∙ 14y agoIn September 1939, after Germany's invasion of Poland. An ultimatum was given to Germany to withdraw its invasion, Germany failed to do so, and war was declared.
Wiki User
∙ 12y agoSep 3rd, 1939
Wiki User
∙ 12y agoSeptember 3rd 1939
Wiki User
∙ 14y ago1939
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