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- Assassination of Archduke Franz Ferdinand
- Austria declares war on Serbia
- Russia mobilizes troops on Germany
- Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, were assassinated on 28 June 1914 by Bosnian Serb student Gavrilo Princip
- Germany declares war on France
- On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War.
- ZIMMERMAN TELEGRAM
- Although Russia had no formal treaty obligation to Serbia, it wanted to control the Balkans, and had a long-term perspective toward gaining a military advantage over Germany and Austria-Hungary. Tsar Nicholas II mobilized Russian forces on 30 July 1914 to threaten Austria-Hungary if it invaded Serbia.
- SINKING OF THE LUSITANIA
- Germany realized that a war with Russia meant a war with France, and so its war plans called for an immediate attack on France through Belgium hoping for a quick victory before the slow-moving Russians could become a factor.
- The Zimmermann Telegram (or Zimmermann Note or Zimmerman Cable) was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico if the United States entered World War I against Germany.
- The RMS Lusitania was a UK-registered ocean liner that was torpedoed by an Imperial German Navy U-boat during the First World War on 7 May 1915, about 11 miles off the Old Head of Kinsale, Ireland.
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