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1. The convoy system, instituted in May 1917, (1 point) cut merchant losses greatly. had failed by November 1917. eliminated the sinking of Allied ships. ended the war. 2. African Americans fighting in World War I were used mostly (1 point) for manual labor. for scouting. as frontline...

1. The German U-boat changed the rules of naval warfare because it (1 point) attacked only in the summer. remained hidden and fired without warning. avoided merchant ships. surfaced before firing its torpedoes. 2. Americans thought German submarine warfare was (1 point) ineffective...