A wish to retaliate and to break Britain's command of the seas motivated Germany to launch its campaign of unrestricted submarine warfare in 1917. The result was to make the blockade even more complete, by provoking the United States to join the Allies
I believe This is the answer. The blockade of Germany was maintained during the period between the armistice and the signing of the Treaty of Versailles in June 1919. ... A wish to retaliate and to break Britain's command of the seas motivated Germany to launch its campaign of unrestricted submarine warfare in 1917.
