After Austria-Hungary's collapse, the Christian Social Party subsequently participated in the formation of the West Ukrainian People's Republic. Following the Polish–Ukrainian War, after western Ukraine had passed under the control of the Second Polish Republic, the party continued to function until the 1930s. At that time, part of its members joined the Ukrainian National Democratic Alliance (UNDO) (a moderate political organization opposed to the radical Organization of Ukrainian Nationalists), while others founded the Ukrainian Catholic People's Party. The latter party advocated autonomy for western Ukraine but was loyal to the Polish state. It was able to place a member in the Polish parliament and Senate but was generally not very influential within Ukrainian society.