Kammala jumla mai zuwa: Bayan kafa Jamhuriyar Poland ta Biyu bayan Yaƙin Duniya na I a 1918, Łachwa ya zama wani ɓangare na Polesie Voivodeship a yankin Kresy. Dangane da ƙididdigar Poland na 1921, yawan mutanen Łachwa ya kai kashi 33 cikin ɗari na Yahudawa. Eliezer Lichtenstein shine Rabi na ƙarshe kafin mamayewar Soviet na Poland a 1939. Bayan Soviet-Jamus
Bayan mamayewar Poland, Tarayyar Soviet ta haɗu da Łachwa kuma ta zama wani ɓangare na SSR na Belorussian.