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).
Austria under National Socialism
SDAP, GVP, and DNSAP were clearly, although for different reasons, in favour a union of German Austria with the German state, which was also a republic by that time (Weimar Republic). The CS also tended to favour the union, but differed at first on a different subject - they were split on the idea of continuing the monarchy instead of a republic. Whereas only the KPÖ decidedly spoke against the annexation in the course of the 1920s and 1930s, the monarchists originally spoke up against the annexation and later turned to favor it, after the Bavarian Soviet Republic had failed, and Germany had a conservative government. The Treaty of Saint-Germain, signed 10 September 1919 by Karl Renner (SDAP), first chancellor of the republic, clearly forbade any union with Germany, abolished the monarchy, and clearly stated the First Austrian Republic as an independent country.