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Archduke Ferdinand is assassinated
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Austria declares war on Serbia
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Germany declares war on Russia
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Germany declares war on France and Belgium
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Germany invades Belgium, British declare war on Getmany
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Ottoman Empire enters war
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First German Zeppelin raid on England
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Sinking of the Lusitania, a passenger ship carrying Americans, by a German U-boat
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Italy enters war
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Battle of Verdun takes over one million casualties, but ends in a stalemate after months of fighting
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Battle of the Somme takes an estimated one million casualties, no clear winner.
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Germany increases U-Boat fighting
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British intercept the Zimmerman Note Telegram supposedly sent from the German Reich to Mexico, urging Mexico to go to war against the US
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Tsar Nicholas of Russia abdicates
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US declares war against Germany
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First US troops land in France
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British capture Jerusalem from the Ottoman Turks
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Allies take back France and Belgium
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Woodrow Wilson reveals his14 points
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RAF (Royal Air Force) is founded
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German planes bomb Paris
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Ottoman Empire signs an armistice
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Kaiser Wilhelm ll abducted and Germany forms Wiemar Republic
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Armistice is signed ending WWI