Austrians
Historically, Austrians were regarded as ethnic Germans and viewed themselves as such. Austria was part of the Holy Roman Empire and the German Confederation until the Austro-Prussian war in 1866 which resulted in Prussia expelling Austria from the Confederation. Thus, when Germany was founded as a nation-state in 1871, Austria was not a part of it. In 1867, Austria was reformed into the Austro-Hungarian Empire. After the collapse of the Austro-Hungarian Empire in 1918 at the end of World War I, Austria was reduced to a rump state and adopted and briefly used the name the Republic of German-Austria ("Republik Deutschösterreich") in an attempt for union with the Republic of Germany, but was forbidden due to the Treaty of Saint-Germain-en-Laye (1919). The First Austrian Republic was founded in 1919. The Third Reich annexed Austria with the "Anschluss" in 1938.
Austria-Hungary
The new Austrian state was, at least on paper, on shakier ground than Hungary. While what was left of Austria had been a single unit for over 700 years, it was united only by loyalty to the Habsburgs. With the loss of 60% of the Austrian Empire's prewar territory, Vienna was now an imperial capital without an empire to support it. By comparison, Hungary had been a nation and a state for over 900 years. However, after a brief period of upheaval and the Allies' foreclosure of union with Germany, Austria established itself as a federal republic. Despite the temporary "Anschluss" with Nazi Germany, it still survives today. Adolf Hitler cited that all "Germans" – such as him and the others from Austria, etc. – should be united with Germany.