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Why Did the U.S. Enter WWI?
The Sinking of Lusitania
May 7th, 1916: German U-boat sink British passenger ship Lusitania, killing 128 Americans. This upset Americans because Germany had disrespected their neutrality.
Unrestricted submarine warfare refers to Germany's decision to sink any ship found in the war zone, because they could no longer tell apart merchant and armed vessels. Americans were angry because Germany was killing Americans while they remained neutral.
Unrestricted Submarine Warfare
The Sussex Pledge was a promise made by Germany in 1916 which stated that it would warn ships before attacking. However, Germany did not keep this pledge, which contributed heavily to America's decision to enter the war against Germany.
The Sussex Pledge
The Zimmerman Note
The Zimmerman note, which was a telegram that Germany sent to Mexico in 1917 that instructed Mexico to go to war with the US, had proven that Germany had hostile intentions toward America.
On April 6, 1917, America enters WWI on the side of the allies because efforts to remain neutral had been futile.
U.S. Enters WWI
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