Catalysts for the U.S intervention into WW1


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  • May 7, 1915- The naval method practiced by the Germans of unrestricted submarine warfare resulted in the sinking of the RMS Lusitania off the coast of Ireland, resulting in the deaths of thousands of neutral civilians. However, upon continuing to sink merchant ships without warning, the U.S reached an agreement with Germany known as the Sussex Pledge, in which the German subs will fire on certain vessels only after giving a warning. However, the promise was shortly broken, prompting the U.S to consider intervening in the war itself.
  • January 197- The United States intercepts a telegram from Arthur Zimmerman to the German ambassador in mexico encouraging Mexico to invade the U.S in exchange for land lost in the Mexican- American War. Outraged, the United States was further pushed towards the decision for the call for war.
  • April 1917- The United States, after witnessing the atrocities and deceit from Germany's side from the Zimmerman letter to the sinking of the Lusitania, formally declares war on the premise that the nation is fighting in the name of democracy and liberty.
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