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Archduke Franz Ferdinand of Austria-Hungary assassinated in Sarajevo by a Serbian activist
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Believing the assassin to be a Serbian nationalist, the Austrians target their anger toward Serbia.
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Austria is now allied with Germany
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The Serbs propose arbitration as a way to resolve dispute, but also begin mobilization of their troops.
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Austria-Hungary severs diplomatic ties with Serbia and begins to mobilize its troops.
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The Austro-Hungarian Empire declares war on Serbia.
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Russia begins full mobilization of its troops.
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Germany declares war on Russia
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Great Britain declares war on Germany. The declaration is binding on all Dominions within the British Empire including Canada, Australia, New Zealand, India and South Africa.
