The party won the largest number of deputies in the first elections held in 1920: they could occupy 92 of the 419 seats in the constituent assembly.
[6] In early 1924, Prime Minister Pašić succeeded in winning the support of some Democratic deputies around Svetozar Pribićević, to reject especially the Croatian demands for more influence.
While Pribićević intransigently persisted on the principle of the unitary Yugoslavia, Davidović favoured moderation and concessions considering the Croatian demands.
The Democratic Party was in and out of government, either independently or as part of a coalition, until 1929 when King Alexander abolished the Vidovdan Constitution and created a personal dictatorship, changing the name of the country to Kingdom of Yugoslavia.
During the invasion of Yugoslavia by Nazi Germany in 1941, Grol and most of the party leadership fled to the United Kingdom.