 Complete the following phrase:  After the dissolution of the Holy Roman Empire in 1806, the double-headed eagle was retained by the Austrian Empire, and served also as the coat of arms of the German Confederation. The German states of Schwarzburg-Rudolstadt and Schwarzburg-Sondershausen continued to use the double-headed eagle as well until they were abolished shortly after the First World War, and so did the Free City of Lübeck until it was abolished by the Nazi government in 1937. Austria, which switched to a single-headed eagle after the end of the monarchy, briefly used a double-headed eagle  with haloes  once again when it was a one-party state 19341938; this, too, was 