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.
Germans
During the 1920s, the constitutions of both the First Austrian Republic and the Weimar Republic included the goal of union between the two countries which was supported by all different political parties. In the early 1930s, before the Nazis seized power, popularity for union between Austria and Germany remained strong and the Austrian government looked at the possibility of a customs union with Germany in 1931 but this was stopped by French opposition. In 1933, after Austrian-born Hitler came to power, support for an "Anschluss" grew. The Austrofascism era of Dollfuss/Schuschnigg between 1934-1938 accepted that Austrians were Germans and that Austria was a "German state" but was strongly opposed to Hitler's desire to annex Austria to the Third Reich and wished for Austria to remain independent.