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Hitler's greatest mistakes post fall of France!
(Without changing the mans character on issues of race and ideology)
Here is my list.
1. Failure to oppose Mussolini's invasion of Greece.
2. Failure to send more forces to North Africa.
3. Declaration of war on the USA.
4. Failure to sort out German production problems earlier.
5. Failure to offer further arms licences to Germanys allies.