Austria
The Treaty of Saint-Germain of 1919 (for Hungary the Treaty of Trianon of 1920) confirmed and consolidated the new order of Central Europe which to a great extent had been established in November 1918, creating new states and altering others. The German-speaking parts of Austria which had been part of Austria-Hungary were reduced to a rump state named The Republic of German-Austria (German: "Republik Deutschösterreich"). The desire for "Anschluss" (annexation of Austria to Germany) was a popular opinion shared by all social circles in both Austria and Germany. On 12 November, German-Austria was declared a republic, and named Social Democrat Karl Renner as provisional chancellor. On the same day it drafted a provisional constitution that stated that "German-Austria is a democratic republic" (Article 1) and "German-Austria is an integral part of the German reich" (Article 2). The Treaty of Saint Germain and the Treaty of Versailles explicitly forbid union between Austria and Germany. The treaties also forced German-Austria to rename itself as "Republic of Austria" which consequently led to the first Austrian Republic.
Austrians
The creation of the Czecho-Slovak and South Slav states, the dissolution of the real union with Hungary, and the post-war treaties imposed by the victorious Allies combined to see the newly established Austrian republic both with the boundaries it has today, and a largely homogeneous German-speaking population. In the Treaty of Saint-Germain, in September 1919 the union with Germany was prohibited, and the new republic's name "Deutschösterreich" was prohibited by the treaty; instead the term "Republic of Austria" was used. The westernmost province Vorarlberg's wish to unite with Switzerland was also ignored. On October 21, 1919, the state changed its name accordingly. Many German Austrian communities were left scattered throughout the other new states, especially in Czechoslovakia, where more than 3 million German Bohemians had not been allowed to become part of the new Austrian state, as well as in the southern part of Tyrol which now found itself part of Italy. In total, more than 3.5 million German-speaking Austrians were forced to remain outside the Austrian state.