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22 November 1918
The Republic of German-Austria (German: Republik Deutschösterreich or Deutsch-Österreich) was created following World War I as the initial rump state for areas with a predominantly German-speaking population within what had been the Austro-Hungarian Empire.
German-Austria claimed sovereignty over all the majority-German territory of the former Habsburg realm: a total area of 118,311 km2 (45,680 sq mi) with 10.4 million inhabitants. This included nearly all the territory of present-day Austria, plus South Tyrol and the town of Tarvisio, both now in Italy; southern Carinthia and southern Styria, now in Slovenia; and Sudetenland and German Bohemia (which later became part of Sudetenland), now in the Czech Republic. At the time, the majority of inhabitants in these regions were German-speaking. In practice, however, its authority was limited to the Danubian and Alpine provinces of the old Habsburg realm (in other words, only most of what is Austria today).
In Habsburg Austria-Hungary, "German-Austria" was an unofficial term for the areas of the empire inhabited by Austrian Germans. With the impending collapse of the empire in late 1918, ethnic German deputies to the Cisleithanian Austrian parliament (Reichsrat) last elected in 1911 sought to form a new rump state of German-Austria. It declared a "provisional national assembly of the independent German Austrian state" and elected Franz Dinghofer of the German National Movement, Jodok Fink of the Christian Social Party, and Karl Seitz of the Social Democratic Workers' Party as assembly presidents. The assembly included representatives from Bohemia, Moravia, and Austrian Silesia who refused to adhere to the new state of Czechoslovakia which had been declared on October 28, 1918.
On November 11, 1918, Emperor Charles I relinquished his right to take part in Austrian affairs of state. The next day, November 12, the National Assembly officially declared German-Austria a republic, and named Karl Renner as provisional chancellor. It drafted a provisional constitution that stated that "German-Austria is a democratic republic" (Article 1) and "German-Austria is a component of the German Republic" (Article 2). The latter provision reflected the deputies' feelings that Austria was no longer viable on its own with the loss of 60 percent of its territory, and the only course was union with Germany. Later plebiscites in the provinces of Tyrol and Salzburg yielded majorities of 98 and 99% in favor of a unification with Germany. On November 22, the national assembly officially laid claim to all ethnic German areas of Cisleithania. However, the Allies of World War I opposed such a move and German-Austria was largely powerless to resist the forces of Italy, Czechoslovakia, and the Kingdom of Serbs, Croats, and Slovenes from seizing territory.
On September 10, 1919, Renner signed the Treaty of Saint Germain and it was ratified by the national assembly on October 21. According to its provisions, the country had to change its name from "German Austria" to Austria. Article 88 of the treaty, sometimes called a "pre-Anschluss attempt", states that "the independence of Austria is inalienable otherwise than with the consent of the Council of the League of Nations"--in effect, barring any attempt by Austria to unite with Germany.  Likewise, in the Treaty of Versailles dictating the terms of peace for Germany, there was a prohibition of unification. With these changes and the settling of Austria's frontiers, the era of the First Republic of Austria began.
German-Austria originally consisted of nine provinces (Provinzen):
- Upper Austria (Oberösterreich), all of the current Austrian state of Upper Austria plus the Bohemian Forest region (Böhmerwaldgau) now in the South Bohemian Region of the Czech Republic;
- Lower Austria (Niederösterreich), all of the current Austrian states of Lower Austria and Vienna, plus German South Moravia (Deutschsüdmähren), now divided between the Czech regions of South Bohemia, Vysočina, and South Moravia;
- German Bohemia (Deutschböhmen), areas of western Bohemia that were later part of Sudetenland from 1938–45, now part of the Czech Republic;
- Sudetenland, parts of the historical regions of Moravia and Austrian Silesia. Boundaries do not correspond to later use of the term Sudetenland.
- Styria (Steiermark), most of historical Styria including the current Austrian state of Styria and the north-eastern part of the Slovenian informal region of Lower Styria;
- Salzburg, all of the current Austrian state of Salzburg;
- Carinthia (Kärnten), all of historical Carinthia including the current Austrian state of Carinthia, the Slovenian unofficial region of Carinthia, the Slovenian municipality of Jezersko and the now Italian municipalities of Tarvisio, Malborghetto Valbruna and Pontebba;
- German Tyrol (Deutschtirol), most of historical Tyrol including the current Austrian state of Tyrol and the present day Italian province of South Tyrol, but not the current Italian province of Trentino;
- Vorarlberg, all of the current Austrian state of Vorarlberg.
Several German minority populations in Moravia, including German populations in Brünn (Brno), Iglau (Jihlava) and Olmütz (Olomouc) also attempted to proclaim their union with German Austria, but failed. The areas now outside of the current Republic of Austria often had significant non-German minorities and occasionally non-German majorities and were quickly taken by troops of the respective countries they were to eventually join. On the other hand, ethnic Germans in the western part of the Kingdom of Hungary that formed a majority in the area known as German West Hungary and agitated to join to Austria were successful and the area became the state of Burgenland, with the notable exception of the region around Ödenburg (Sopron) which was also intended to be the state capital, but due to a very contentious plebiscite, remained part of Hungary. The only other part of the former German counties of 'Burgenland' in the Kingdom of Hungary also not to become part of the Austrian Republic due to the treaty was Preßburg (Bratislava) which went to Czechoslovakia.
Despite the prohibition of the use of the term "German-Austria", the republic's unofficial national anthem between 1920 and 1929 was "German Austria, you wonderful country" (Deutschösterreich, du herrliches Land). Its words were penned by then-Chancellor Karl Renner, a signatory of the Treaty of Saint Germain.
See also 
- The Kingdom of Hungary had become the Hungarian Democratic Republic in 1918.
- "Treaty of Peace between the Allied and Associated Powers and Austria; Protocol, Declaration and Special Declaration  ATS 3". Austlii.edu.au. Retrieved 2011-06-15.