1938 Anschluss plan to group all German peoples into one country is put into action; Munich Conference
Austria was annexed by Germany in 1938 (to form 'Greater Germany'). At the end of World War 2 Austria's independence was restored.
1938
1870
March 12th 1938
The Anschluss (Annexation of Austria into Germany) happened in 1938 = =
The German military invaded Austria on March 12, 1938. The annexation of Austria was officially completed on April 10 of the same year.
March 12, 1938, it was called the 'Anschluss'.
Austria-Hungary was not a part of Germany; it was a monarchy ruled by Franz Josef the first, that split into pieces after the First World War. During the same period, Germany was run by Kaiser Wilhelm the first and the second. ___ Until 1866 Austria was part of the German Confederation and in fact officially the 'top dog' in Germany. In 1866 Prussia expelled Austria by force (in a war, that is) and dissolved the German Confederation. The following year Austria agreed to share power with Hungary, and Austria-Hungary was formed. So the answer above is technically correct but it is useful to have more background.
Following Archduke Franz Ferdinand of Austria-Hungary's death in June 1914 Germany instantly got involved helping Austria-Hungary by quickly overrunning: Belgium, Russia and France in the early stages.
Since it was annexed in 1938, it entered WWII together with Germany in September 1939.
Austria was not invaded by Germany. Austria was ANNEXED by Germany about 1938. Austria did not try to prevent the annexing. That is reason after WW2 Austria was not considered as a German partner during WW2
Germany annexed Austria in 1938 one year before WWII. The name of the annexation was called Anschluss.