Rubuta ci gaba don wannan sakin layi - Bayan Yaƙin Duniya na I, Poland ta sake samun 'yanci, kuma a cikin 1920, Sulmin ya sake haɗuwa da Poland, bisa ga ƙa'idodin Yarjejeniyar Versailles. A lokacin Yaƙin Duniya na II (1939<unk>1945) yankin ya kasance ƙarƙashin mamayar Jamus
Ka yi haƙuri. A farkon Maris 1945, ba da daɗewa ba kafin ƙarshen Yaƙin Duniya na II, Red Army ya mamaye yankin. Bayan karshen yakin an mayar da shi zuwa Poland.