Three Reasons That Pushed Germans Out Of Germany
1. Stages Of World War Two caused them to flee
2. They did not have a solid territory
3. 3 Million people went missing whose fate was clarified therefore no one felt safe
(4. In 1953 the West German government ordered a survey by the Suchdienst (search service) of the German churches to trace the fate of 16.2 million people in the area of the expulsions)
Hope this helps <3