WORLD HISTORY

Detailed explanation-1: -Austria-Hungary took advantage of the Ottoman Empire’s retreat by occupying Bosnia-Herzegovina, a region in the Balkans that the empire annexed in 1908. Franz Ferdinand, archduke of Austria, and his wife Sophie riding in an open carriage at Sarajevo shortly before their assassination.

Detailed explanation-2: -Austria-Hungary was one of the Central Powers in World War I, which began with an Austro-Hungarian war declaration on the Kingdom of Serbia on 28 July 1914. It was already effectively dissolved by the time the military authorities signed the armistice of Villa Giusti on 3 November 1918.

Detailed explanation-3: -The immediate reason for Austria’s ultimatum was the assassination of Archduke Franz Ferdinand and his wife Sophie in Sarajevo, Bosnia on June 28, 1914 by the Bosnian Serb nationalist, Gavrilo Princip.

Detailed explanation-4: -On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War.

Detailed explanation-5: -The announcement in October 1908 of Austria-Hungary’s annexation of Bosnia and Herzegovina upset the fragile balance of power in the Balkans, enraging Serbia and pan-Slavic nationalists throughout Europe.