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Great Britain and France abandoned the policy of German appeasement.
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the event was when Germany invaded Poland. when Britain and France found out they declare war on Germany.
The 1939 invasion of Poland caused Britain to declare war on Germany, which started WWII.
With the invasion of Poland in 1939.
Invasion of Poland, September 1, 1939.
1939- Poland and annexed Austria 1940- Holland and Belgium, France