Does this passage imply about the importance of laws within individual states?

Which statement about submarine use in world war i is true? the allies never found a way to counter german submarine warfare. germany’s use of submarines affected the united states’ decision to enter the war. only the germans used submarines in world war i.

What are three supporting points as to why opium was wrong in the chinese trade? why should it have stopped? (opium wars)

What were two theories put forth by marx?