How did the German use of submarines affect World War II?
Germany was fairly effective in its use of submarines in World War II. Only by continuing to destroy the U-boats and their support systems did we turn the tide. That and by building merchant marine shipping vessels (the Liberty ships) and the war materials they transported faster than the Germans could sink them were we able to gain a tactical advantage and win the war. The German use of the U-boat caused the conflict to stretch on longer than it might have otherwise.
