The use of submarines during world war i resulted in

the sinking of passenger liners.
a quick end to the war.
the poisoning of water supplies.
greater support for air attacks.

I believe the answer is: the sinking of passenger liners.

The most notable one was The sinking of the Cunard ocean liner RMS Lusitania which happened on Friday, 7 May 1915 .

The ship belonged to united kingdom. Since they are united states' ally , this event force United States to declared war to Germany and join the world war I.

it is a part of john locke's natural rights popular during the age of enlightenment that people had inalienable rights to life, liberty and property. this was reflected by thomas jefferson in his declaration of independence as rights to life,liberty and the pursuit of happiness.

another line in the declaration of independence is that people have certain rights just because they are human. humans are capable of obeying the three natural rights john locke mentioned making them governable by these laws and therefore entitled to these rights as well.

answer; does not include a reference to the audience;