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Archduke Ferdinand is killed
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Austria-Hungary declares war on Serbia
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Germany declares war on Russia France and Belgium
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First battle of WWI, the First Battle of Marne is started and trench warfare is first used
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Britain and France declare war against the Ottoman empire
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Cruiser Lusitania is sunk
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Britain and German engage in combat off the coast of Jutland
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British engage in the First Battle of Somme, the bloodiest day for the British army
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Tsar Nicholas II abdicates the throne of Russia
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US declares war against Germany
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Tanks are first used heavily in combat
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Germany and the Allied powers concede to an Armistice