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Archduke Franz Ferdinand is assassinated in Sarajevo
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Austria-Hungary declares war on Serbia
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Russia mobilizes its army to intervene in the conflict involving its ally, Serbia
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Germany invades Belgium, beginning World War I
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Germany uses chlorine gas filled shells on Allied lines
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Lusitania sinks
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Germany limits its submarine use
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Britain deploys the first tank
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Germany resumes unrestricted submarine warfare
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British intelligence intercepts the Zimmerman Telegram
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President Wilson outlines his case for war to Congress
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The U.S. enters World War I on France and Britain's side
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Selective Service Act allows a draft to be carried out
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Germany and Russia make peace
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The Battle of Cantigny is the first American offensive of the war
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The Americans attack the Germans at Chateau-Thierry
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Battle of Belleau Wood
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Belleau Wood ends
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Kaiser Wilhelm abdicates
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Armistice Day