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Archduke Ferdinand Assassinated
Archduke Franz Ferdinand of Austria-Hungary assassinated in Sarajevo by a Serbian activist -
Austria's government reacts to assassination
Believing the assassin to be a Serbian nationalist, the Austrians target their anger toward Serbia. -
"Blank Check" made
Austria is now allied with Germany -
Austria's ultimatum to Serbia
The Serbs propose arbitration as a way to resolve dispute, but also begin mobilization of their troops. -
Serbia's response to Austria
Austria-Hungary severs diplomatic ties with Serbia and begins to mobilize its troops. -
Austria declares war on Serbia
The Austro-Hungarian Empire declares war on Serbia. -
Russia's reaction
Russia begins full mobilization of its troops. -
Germany's reaction to Russia
Germany declares war on Russia -
Great Britain's reaction to Germany
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.