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heir to the throne of Austro-Hungarian empire, in Sarajevo, Bosnia
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Austria-Hungary declares war on Serbia
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Battle of Tannenberg, which Russia loses; Germany's greatest success of the war on Eastern Front
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German U-boat attacks on Allied and neutral shipping; declares blockade of Britain
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German attack on Verdun in the longest battle of the war, ultimately defended by the French at great cost to both sides
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US President Woodrow Wilson requests statements of war objectives from warring nations in peace note
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Allies state peace objectives in response to US President Woodrow Wilson's December 1916 peace note
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Zimmermann Telegram is passed to the US by Britain, detailing alleged German proposal of an alliance with Mexico against the US
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US President Woodrow Wilson makes "Four Principles" speech to Congress
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Peace conference accepts principle of a League of Nations