What event finally caused the U.S. to enter World War I? The Zimmerman telegram was sent to Mexico. A submarine sank the RMS Lusitania. Three ships were sunk off the Eastern seaboard. The government thought Germany would win.
Answers
this event caused the U.S. to enter world war 1, Unrestricted Submarine Warfare would eventually lead to German submarines sinking ships coming from the United States to Britain. One major example would be the sinking of the ocean liner RMS Lusitania on May 7, 1915.
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Sinking RMS Lusitania was the reason behind United States entry in the World War I. RMS Lusitania, world’s largest passenger ship was sunk down by a German U boat back in 1915. President Woodrow Wilson declared war on Germany as it broke the threshold capacity of America by sinking innocent passengers along with RMS Lusitania.
American doesn’t got any good opinion over the Germans even before the sinking of Lusitania because of its atrocities and war crimes in Belgium formally known as Rape of Belgium. Other than Lusitania sinking, Germany's plan of allying with Mexico is another prominent reason for America’s deceleration war on Germany and entry to the World War I.