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Heir of the of the Austro-Hungarian throne, Archduke Franz Ferdinand was murdered in Sarajevo by Gavrilo Princip, a member of the Black Hand Gang.
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Austria declared war on Serbia
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Germany had an alliance with Austria-Hungary, so they declare war o Russia
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Britain declared war on Germany
The Triple Alliance (Germany, Austria-Hungary and Italy) against
The Triple Entente (France, Britain and Russia) -
A trench war in which around a million soldiers were killed