Eisenwerke Oberdonau was created after what annexation of Austria into Nazi Germany?
Eisenwerke Oberdonau:  Created after the Anschluss of Austria, it formed the part of the so-called "Reichswerke Hermann Göring AG" cartel, the main supplier of steel and iron for the German war industry during World War II. Anschluss: Anschluss (] 'joining') is the annexation of Austria into Nazi Germany on 12 March 1938.
Anschluss