In November 1918, the army of the Kingdom of Serbia entered Modoš, which became part of the Banat, Bačka and Baranja region, first of the Kingdom of Serbia and then of the Kingdom of Serbs, Croats and Slovenes (renamed to Yugoslavia in 1929). In 1918-19, it was part of the Veliki Bečkerek County within the Kingdom. However, in July 1919, the town was assigned to Romania. In 1924, the town, together with a few other settlements, was returned to the SCS Kingdom in exchange for the town of Jimbolia and a few other settlements, which were transferred to Romania. In the same year (1924), the name of the town was changed to Jaša Tomić. From 1924 to 1929 it was part of Podunavlje Oblast with its administrative seat in Smederevo, and from 1929 to 1941 part of Danube Banovina, with its administrative seat in Novi Sad. From 1941 to 1944, it was under Axis occupation and was included in the German-administered region of Banat, which formally was part of Serbia.