State of Slovenes, Croats and Serbs
The new kingdom was made up of the formerly independent kingdoms of Serbia and Montenegro (Montenegro having been absorbed into Serbia the previous month), and of a substantial amount of territory that was formerly part of Austria-Hungary, the State of Slovenes, Croats and Serbs. The main states which formed the new Kingdom were the State of Slovenes, Croats and Serbs; Vojvodina; and the Kingdom of Serbia with the Kingdom of Montenegro.