USA HISTORY

Detailed explanation-1: -Chronicling America : Historic American Newspapers. A month after the assassination of Archduke Franz Ferdinand and his wife Sophie on July 28, 1914, the Austro-Hungarian government declares war on Serbia. Immediately, and within a period of six days, European countries declare war upon one another.

Detailed explanation-2: -Austria-Hungary, with German encouragement, declared war on Serbia on 28 July. Russia’s support of Serbia brought France into the conflict.

Detailed explanation-3: -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-4: -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.