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.
unsophisticated.
uncivilized.
too restrictive.
3. German submarines aimed to attack ships that were carrying (1 point)
weapons to the Allies.
passengers to the United States.
food to the Central Powers.
oil to Mexico.
4. The United States broke off diplomatic relations with Germany when (1 point)
the Zimmermann note was released
Germany violated the Sussex pledge
the Russian Revolution took place.
the British cut the transatlantic cable.
5. After the Russian Revolution, Americans were (1 point)
more willing to join the Allies.
more sympathetic to Germany.
frightened of Russia.
reluctant to help the revolutionaries.
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.
unsophisticated.
uncivilized.
too restrictive.
3. German submarines aimed to attack ships that were carrying (1 point)
weapons to the Allies.
passengers to the United States.
food to the Central Powers.
oil to Mexico.
4. The United States broke off diplomatic relations with Germany when (1 point)
the Zimmermann note was released
Germany violated the Sussex pledge
the Russian Revolution took place.
the British cut the transatlantic cable.
5. After the Russian Revolution, Americans were (1 point)
more willing to join the Allies.
more sympathetic to Germany.
frightened of Russia.
reluctant to help the revolutionaries.