The Sussex Pledge
unrestricted submarine warfare
Germany's unrestricted submarine warfare
it was Germany.
unrestricted submarine warfare
Germany's submarine warfare was unrestricted. These attacks led to World War I.
on feb 1 1917 German government decided to begin submarine warfare unrestricted
Germany practiced unrestricted submarine warfare.
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Help end the British blockade
it referred to sinking ships
To get the blockade lifted.
American enterance into WWI.