History of Austria
Austria was dominated by the House of Habsburg and House of Habsburg-Lorraine ("Haus Österreich") from 1273 to 1918. In 1808, when Emperor Francis II of Austria dissolved the Holy Roman Empire, Austria became the Austrian Empire, and was also part of the German Confederation until the Austro-Prussian War of 1866. In 1867, Austria formed a dual monarchy with Hungary: the Austro-Hungarian Empire (1867–1918). When this empire collapsed after the end of World War I in 1918, Austria was reduced to the main, mostly German-speaking areas of the empire (its current frontiers), and adopted the name The Republic of German-Austria. However the union and name were forbidden by the Allies at the Treaty of Versailles. This led to the creation of the First Austrian Republic (1918-1933).
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.