Final answer:
The Lusitania was sunk by a German U-boat during World War I, causing the loss of 1,200 lives. Many Americans saw it as an act of aggression and this event played a role in drawing the United States into the war.
Step-by-step explanation:
The RMS Lusitania, a British passenger ship, was sunk by a German U-boat on May 7, 1915. The sinking of the Lusitania was an act of warfare during World War I. Many Americans viewed it as an act of unprovoked aggression, especially because 128 Americans were among the 1,200 lives lost.
The German government defended the sinking as an act of self-defense and claimed that they had published warnings about the danger of traveling on British vessels, some of which specifically named the Lusitania as a target. However, the sinking of civilian vessels like the Lusitania only served to unite their opponents and potentially draw the United States into the war.