Austria-Hungary

Austria-Hungary, formally the Austro-Hungarian Monarchy, was the Dual Monarchy created by the Ausgleich (Compromise) of 1867, uniting the Austrian Empire and the Kingdom of Hungary under a single Habsburg sovereign while granting Hungary extensive autonomy. In 1914 it was a multi-ethnic empire of 51 million people encompassing Germans, Hungarians, Czechs, Poles, Slovaks, Croats, Slovenes, Bosniaks, and others. The empire entered World War I as a Central Power after issuing the ultimatum to Serbia that triggered the July Crisis, driven by the conviction that Serbian nationalism must be crushed or the empire would dissolve. Four years of war it could barely sustain led to the empire's disintegration in October-November 1918 into the successor states of Austria, Hungary, Czechoslovakia, Yugoslavia, and Poland. Emperor Karl I (Kaiser Karl I) was the last Habsburg ruler, succeeding Franz Joseph I in November 1916.

• Existed: 1867 CE – 1918 CE
• Type: Entity
• Government: Constitutional Monarchy (Dual)
• Capital: Vienna