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Germany hoped that submarine warfare would lead to war.
Germany's unrestricted submarine warfare
it was Germany.
Germany's submarine warfare was unrestricted. These attacks led to World War I.
Germany practiced unrestricted submarine warfare.
Help end the British blockade
Submarine Warfare
To get the blockade lifted.
American enterance into WWI.
Unrestricted Submarine Warfare.
Germany's declaration of unlimited submarine warfare
Germany resumed unrestricted submarine warfare in 1915. The Germans declared the waters around the British Isle a war zone. The would attack any merchant ship entering that area.