What was one effect of unrestricted german submarine attacks on shipping in world war i? a. the united states led the berlin airlift. b. british and french supplies never reached their troops. c. the united states moved closer to declaring war on germany. d. the german navy became the most powerful naval force in the world.

B i believe. That may have been WWII though. their U-boats would take out french and english ships a lot tho.

Bis your answer and your welcome

Just think, why was it effective? -it appeled to critics because it was written well, that made it noticeable to the public including the white population-it was also recognizable to the african americans because it was about their heritage.-it was powerful just keep finding more points and elaborate on them. message me if you need more