The appeasement made his hopes for imperialism stronger. This made the war possible.
Step-by-step explanation:
The appeasement policies on Germany by the Allied powers meant that they were in the middle of an expansion spree and Hitler's popularity had soared because of it.
As the other nations did not do much to prevent it the Germans were hoping they would not care when the invade other nations too.
This became the root of the conflict as when the nations retaliated Germany locked down and started the war against them for which it had prepared more than the others,