What does Lusitania mean in World War 1?

The Lusitania was a British ocean liner that was sunk by a German U-boat on May 7, 1915, during World War I. The attack resulted in the deaths of 1,198 passengers, including 128 Americans, and it significantly shifted public opinion against Germany in the United States. The sinking of the Lusitania is often cited as one of the key events that contributed to the U.S. entering the war in 1917. It symbolized the dangers of unrestricted submarine warfare and highlighted the impact of naval warfare on civilian lives.