Kammala jumla mai zuwa: Bayan Yarjejeniyar Versailles, an mayar da Chełmno Land zuwa Poland a watan Janairun 1920, bayan da 'yan Poland suka sake samun' yanci a 1918. A cikin lokacin tsakanin yaƙe-yaƙe ya zama kudancin yankin Pomeranian Voivodeship tare da babban birnin a Toruń. An mamaye shi bayan mamayewar Poland a watan Satumbar 1939 da Nazi Jamus kuma ta haɗu da ita a watan Oktoba, duk da haka, ba tare da samun amincewar ƙasa da ƙasa ba. A lokacin da
A lokacin mamayar, 'yan Jamus sun aiwatar da "Intelligenzaktion", wani kisan gilla da aka shirya na manyan mutanen Poland na gida. Tuni a cikin kaka na 1939, an kashe kusan 'yan Poland 23,000 na Pomeranian Voivodeship kafin yakin. A watan Janairun 1945 sojojin Red Army suka kama shi kuma mamayar Jamusawa ta wannan ɓangaren Poland ta ƙare.