First of all, read up on The Polish Corridor, the Danzig Corridor. The Treaty of Versailles. Also, Germany's access to sea ports. Then, read up on the plebiscites that took place in the 20s in re the same, and the German ethnic community in the Corridor.
First of all, read up on The Polish Corridor, the Danzig Corridor. The Treaty of Versailles. Also, Germany's access to sea ports. Then, read up on the plebiscites that took place in the 20s in re the same, and the German ethnic community in the Corridor.