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Archduke Franz Ferdinand assassinated
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World War I begins
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The H.M.S. Lusitania is sunk by German U- Boats
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Germany limits submarine warfare
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Tanks are introduced
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Russian cease-fire declared
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Germany resumes unrestricted submarine warfare
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Zimmermann Telegram
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America enters the war
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Woodrow Wilson drafts the Fourteen Points
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The Red Baron is shot down
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World War I ends
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Treaty of Versailles signed