Austria–Germany relations the allegations. Austria–Germany relations Relations between Austria and Germany are close, due to their shared history and language, with German being the official language and Germans being the largest ethnic group of both countries. Modern-day Austria and Germany were united until 1866: their predecessors were part of the Holy Roman Empire and the German Confederation until the unification of German states under Prussia in 1871, which excluded Austria. In 1918 after the end of World War I, Austria renamed itself the Republic of German-Austria in an attempt for union with Germany but this was forbidden by the Treaty of Saint-Germain-en-Laye
States of Austria 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