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Answer:
Answer and explanation down
Explanation:
Go to Wikipedia for more details: The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939, and the subsequent declarations of war on Germany made by Britain and France, but many other prior events have been suggested as ultimate causes.
Hitler's invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany,making the beginning of world war 2