Treaty of Versailles (1919)
Silesian Uprisings (1918-1919)
Polish Corridor
Return of the Saar region (1935)
Remilitarization of the Rhineland (1936)
Anschluss with Austria (1938)
Munich Agreement (1938)
Treaty of the Cession of the
Memel Territory to Germany (1939)
Seizure of Czechoslovakia (1939)

Potsdam Conference (1945)
Treaty of Zgorzelec (1950)
Treaty of Warsaw (1970)
Two Plus Four Treaty (1990)
German-Polish Border Treaty (1990)
Oder-Neisse line (current eastern border)

Territorial changes of Poland
Territorial changes of the Baltic states