Yugoslavia: Polity Style: 1918-1941

18 Nov/1 Dec 1918	Serbia and the State of Slovenes, Croats and Serbs formed the Kingdom of Serbs, Croats and Slovenes in accordance with the proclamations made by Aleksandar, the Heir to the Throne of Serbia (in the name of King Petar I) and the delegation of the National Council of Slovenes, Croats and Serbs at a public ceremony held on 1 Dec 1918 in Belgrade (Serbia National Assembly Minutes 1918, pp. 10-12)
18 Nov/1 Dec 1918 - 28 Jun 1921	Kraljevstvo Srba, Hrvata i Slovenaca (Краљевство Срба, Хрвата и Словенаца) ^{sr-l, cr (sr-c)} = Kraljestvo Srbov, Hrvatov in Slovencev ^sl \| Kingdom of Serbs, Croats and Slovenes
15 Jul 1920	the word "kraljevstvo/kraljestvo" in the names of laws is replaced with "kraljevina" in accordance with a resolution passed by the Provisional Representation (Privremeno narodno predstavništvo ^{sr-l, cr} \| Привремено народно представништво ^sr-c \| Začasno narodno predstavništvo ^sl ) at the session held on 15 Jul 1920 in Belgrade (Provisional Representation Proceedings 1919-1920, 5:228-229) [1]
28 Jun 1921	the Constitution of the Kingdom of Serbs, Croats and Slovenes is adopted by the Constituent Assembly (Ustavotvorna Skupština ^{sr-l, cr} \| Уставотворна скупштина ^sr-c \| Ustavodajna skupščina ^sl ) on 28 Jun 1921 and promulgated by the Heir to the Throne in the name of the King on 28 Jun 1921 (Yugoslavia Constituent Assembly Proceedings 1920-1921, Volume II, No. 55, 28 Jun 1921, pp. 5-8; Yugoslavia Official Gazette 1919-1945, No. 142A, 28 Jun 1921) [2]
28 Jun 1921 - 4 Oct 1929	Kraljevina Srba, Hrvata i Slovenaca (Краљевина Срба, Хрвата и Словенаца) ^{sr-l, cr (sr-c)} = Kraljevina Srbov, Hrvatov in Slovencev ^sl \| Kingdom of Serbs, Croats and Slovenes
4 Oct 1929	the name of the state is changed in accordance with a law issued and promulgated by the King of the Serbs, Croats and Slovenes on 3 Oct 1929, effective on publication (Yugoslavia Official Gazette 1919-1945, No. 232, 4 Oct 1929, pp. 1-2) [3]
4 Oct 1929 - 17 Apr 1941	Kraljevina Jugoslavija (Краљевина Југославија) ^{sr-l, cr, sl (sr-c)} \| Kingdom of Yugoslavia
17 Apr 1941	capitulation of Yugoslav forces and collapse of central government, polity dissolved and partially annexed by foreign intervention

The resolution of the Provisional Representation affected the names of some laws passed by the Provisional Representation. The change was implemented gradually by the state institutions of the Kingdom. The new polity style was finally confirmed by the Constitution coming into operation on 28 Jun 1921.
Full title: Ustav Kraljevine Srba, Hrvata i Slovenaca (Устав Краљевине Срба, Хрвата и Словенаца) ^{sr-l, cr (sr-c)}; Ustava Kraljevine Srbov, Hrvatov in Slovencev ^sl.
Full title: Zakon o nazivu i podeli Kraljevine na upravna podrušja (Закон о називу и подели Краљевине на управна подручја) ^{sr-l, cr (sr-c)}; Zakon o nazivu in razdelitvi kraljevine na upravna območja ^sl.