Austria-Hungary

Austria-Hungary (also known as the Austro-Hungarian Empire, Austro-Hungarian monarchy or k.u.k. Monarchy), more formally known as the Kingdoms and Lands Represented in the Imperial Council and the Lands of the Holy Hungarian Crown of Saint Stephen, was a constitutional monarchic union between the crowns of the Austrian Empire and the Kingdom of Hungary in Central Europe. The union was a result of the Austro-Hungarian Compromise of 1867, under which the House of Habsburg agreed to share power with the separate Hungarian government, dividing the territory of the former Austrian Empire between them. The Austrian and the Hungarian lands became independent entities enjoying equal status. Austria-Hungary was a multinational realm and one of the world's great powers at the time. The dual monarchy existed for 51 years until it dissolved on 31 October 1918 at end of World War I. Three decades after its dissolution, most of former Austria-Hungary became part of the Soviet Union or the East Bloc countries.

The realm comprised modern-day Austria, Hungary, Bosnia and Herzegovina, Croatia, the Czech Republic, Slovakia, Slovenia, large parts of Serbia and Romania and smaller parts of Italy, Montenegro, Poland and Ukraine.

Read more about Austria-Hungary:  Structure and Name, Economy, Ethnic Relations, Dissolution, Military