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  • Germany sank the Lusitania of the United Kingdom on May 7th, 1915, killing 114 Americans.
  • Germany practiced "Unrestricted Submarine Warfare" - a tactic in which submarines sink ships without warning that approach their waters.
  • The Sussex pledge was a promise by Germany not to sink unarmed ships and to ignore passenger ships.
  • The Zimmermann Telegram from Germany proposed a military alliance between Mexico and Germany if the US joined the war against Germany
  • The United States of America enters WWI.
  • FIN
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