Territorial evolution of Germany

The territorial evolution of Germany in this article includes all changes in the modern territory of Germany from its unification making it a country on 1 January 1871 to the present, although the history of both "Germany" as a territorial polity concept and the history of the ethnic Germans are much longer and much more complex. Modern Germany was formed when the Kingdom of Prussia unified most of the German states, with the exception of multi-ethnic Austria (which was ruled by the German-speaking royal family of Habsburg and had significant German-speaking land), into the German Empire.

Source: Wikipedia — Territorial evolution of Germany (CC BY-SA 4.0)