The states of Upper Austria and Lower Austria are essentially equivalent to what were since 1783/84 the two autonomous halves of the Archduchy of Austria, a principality which formed the empire's historic heartland. Salzburg is coterminous with the former Austro-Hungarian Duchy of Salzburg (the former Archbishopric). Similarly, the state of Carinthia descends from the Duchy of Carinthia, the state of Styria descends from the Duchy of Styria, and the state of Tyrol descends from the Princely County of Tyrol; these states had to cede territories to Italy and Yugoslavia when Austria emerged in its present form. Also, the state of Vorarlberg had been a semi-autonomous part of the County of Tyrol since 1861. The city-state of Vienna was a part of Lower Austria up until 1921. The state of Burgenland is made up of the predominantly German-speaking area that the Kingdom of Hungary until 1921 had to cede to the First Austrian Republic after World War I as a result of the Treaties of Trianon and Saint-Germain-en-Laye.