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Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by Serbian nationalist Gavrilo Princip while the couple were visiting Sarajevo.
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after Germany invades Belgium
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May 7 - The British ocean liner RMS Lusitania is sunk by German U-boat, U-20
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Germany sends the secret Zimmerman Telegram to Mexico in an effort to entice Mexico to join the war. The British intercept and decipher the coded message.
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The Bolsheviks successfully overthrow the Russian government.
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U.S. President Woodrow Wilson issues his Fourteen Points to peace.
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officially ends WWI.