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What action of German aggression finally pushed Britain and France to declare war on Germany in 1939?

User Akro
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Answer: On September 1, 1939, Hitler invaded Poland from the west; two days later, France and Britain declared war on Germany, beginning World War II. On September 17, Soviet troops invaded Poland from the east.

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User Praveen M P
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Answer: They moved into Poland without Poland doing anything.Germany was trying to break the lines of France by getting on their borders

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User Marylu
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