Republic of German-Austria
Charles succeeded to the thrones in November 1916 following the death of his granduncle, Franz Joseph. He made secret attempts to negotiate Austria-Hungary's exit from the First World War but was unsuccessful. Despite Charles' efforts to preserve the empire by transforming it into a federal union, Austria-Hungary hurtled towards disintegration: Czechoslovakia and the State of Slovenes, Croats and Serbs were proclaimed, and Hungary broke monarchic ties to Austria by the end of October 1918. Following the Armistice of 11 November 1918, Charles "renounced participation" in state affairs, but did not abdicate. The Republic of German-Austria was proclaimed the following day, and in April 1919 he was formally dethroned by the Austrian Parliament and exiled to Switzerland.