Well, the three problems that mainly affected Germnay and gave Hitler a stronghold starts with the Treaty of Versailles. After losing WWl, Germany was forced to sign the treaty that plunged their land into poverty. So, the three things on this treaty are your three problems. They are:
1. Germany was forced to give up a large amount of its army
2. Germany was forced to give large amounts of thier land to the French.
3. Germany had to pay large sums of money for war reperations.
One problem was Hitler taking over Europe and having Nazi Germany grow more. Another problem was the great depression that not only affected the U.S. but also affected Europe and Japan. The third problem was Hitler using Japan and Italy to try and conquer Europe.
Hope this helps :).
