How did Germany's use of unrestricted submarine warfare bring America into World War I?

1 Answer
May 22, 2018

Specifically the sinking of the Lusitania and its aftermath.


The Lusitania was torpedoed in 1915 with the loss of over 1,00 lives including 128 Americans. There was an outcry in the US. However President Wilson held off declaring war.
2 years later when the Germans announced unrestricted submarine warfare, this pushed American public opinion over the brink and the USA declared war on Germany.