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On June 28, 1914, Archduke Franz Ferdinand of Austria, Assassinated in Sarajevo, leading Austria to declare war on Serbia, whch brought Germany, Russia , England and France into war due to their treaties.
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The German use of unrestricted submarine wafare resulted in the sinking of the passenger ship the Lusitania on May 7, 1915 - resulting in the loss of 1,198 civilian lives, including 128 Americans. The world, and the U.S. in particular, were shocked.
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On April 6, 1917, after standing on the sidelines for nearly three years, the U.S. entered the war on the side of the Allies. The Zimmerman Note in which Germany encouraged Mexico to attack the U.S.) and Germany's unrestricted submarine warfare were major reasons the U.S. enteredf the war.
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On November 17, 1917, Vladimir Lenin leads a successful revolt and takes over as the leader of Russia.
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In December 1917, Russia quits the war!
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On November 11, 1918, Germany and its allies surrendered, leadin to the signing of the Treaty of Versailles.
