World War I: Lands of the Crown of Saint Stephen, a state union of Kingdom of Hungary and Triune Kingdom of Croatia, Slavonia and Dalmatia is abolished with decisions of Croatian and Hungarian parliaments.

The Lands of the Crown of Saint Stephen, informally Transleithania, were the Hungarian territories of Austria-Hungary, throughout the latter's entire existence, and which disintegrated following its dissolution. The name referenced the historic coronation crown of Hungary, known as the Crown of…