Austria-Hungary (Ausgleich of 1917)

Austria-Hungary was a state in Central Europe for 50 years from the Austro-Hungarian Compromise of 1867 until the Federalisation of the Dual Monarchy in 1917. It was a constitutional monarchy comprising two equal parts in a personal union - the Empire of Austria and the Kingdom of Hungary. It along with the German Empire formed first the Dual Alliance and then the Triple Alliance, which started the First World War.

After 1878, Bosnia and Herzegovina was under Austro-Hungarian rule and this brought the nation into conflict with Serbia. Emperor Francis Joseph I's nephew and heir Franz Ferdinand was killed in Sarajevo by assassins from Serbia and due to a complex chain of alliances, war broke out all across Europe. After the old emperor died, his successor Charles I dissolved the Triple Alliance and signed a separate peace with the Triple Entente giving up some land and later creating the Austrian Commonwealth.