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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.

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13y ago

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