What disagreement caused world war 1?

The assassination of Archduke Franz Ferdinand of Austria on June 28, 1914, in Sarajevo, the provincial capital of Bosnia-Herzegovina (formally annexed by Austria-Hungary in 1908), by a Serbian nationalist, Gavrilo Princip, was the trigger that set off a chain of events leading to the outbreak of World War I.

What is the difference between an emperor and a leader?

What could be the immediate cause of World War I?

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