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  • The Reasons Why the U.S. Entered WWI
  • Unrestricted Submarine Warfare increased tensions among America and Germany
  • The sinking of the Lusitania killed over 100 Americans, angering Americans greatly
  • Germany promises to stop destroying neutral American ships
  • The Sussex Pledge promised to stop the indiscriminate sinking of non-military ships, which they did not follow.
  • Zimmermann Telegram was decoded which depicted that the Germans will ally with the Mexicans if the US joins the war.
  • The U.S. patience breaks, they enter the war and become one of the most influential factors
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