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.
Austria–Czech Republic relations
Both countries have a long common history. For the first time united from 1253 until 1276 under the reign of Přemysl Otakar II, they later joined again and, together with Hungary, formed a major European power under the Habsburg dynasty which lasted from 1526 until 1918. Initially only a personal union, the ever more centralized monarchy ruled mostly from Vienna (Prague was the capital only from 1583 until 1611) was increasingly seen as an obstacle of the Czech and German national interests during the uprising of nationalism in Central Europe from the second half of the 19th century. The Czechs demanded to be ruled by a government in Prague, the capital city of their kingdom, not in Vienna, and as part of their main party strategy of passive resistance did not participate for years in the political discussions and decisions of the Austrian "Reichsrat", the parliament in Vienna representing all nations of the Austrian part of the Austro-Hungarían Monarchy. Ethnic Germans at the same time wanted to participate in the ongoing German unification process.