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Franz Ferdinand is assassinated by Serbia extremists
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Austria-Hungary declares war on Serbia.
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Germany declares war on Russia
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Germany declares war on France and invades Belgium .
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First British troops land in France.
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Great Britain and France declare war on Austria-Hungary.
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Japan declares war on Germany.
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Austria tries to invade Serbia for the third time.
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Germany declares waters to be war zones.
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The Armenian Genocide where 1.5 million Armenians are killed in the ottoman empire.
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Italy joins the war after signing the Treaty of London.
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German U-boat sinks British passenger Lusitania.