Final answer:
The sinking of the Lusitania led to U.S. involvement in WWI due to American casualties and diplomatic responses to German actions.
Explanation:
The attack on the Lusitania was significant due to its role in influencing the United States' entry into World War I. With the loss of American lives and public outrage, President Woodrow Wilson's threat to Germany resulted in the Sussex Pledge to spare crew members on ships. However, Germany's resumption of unrestricted submarine warfare caused further tension and diplomatic issues with the U.S.
Learn more about Impact of the Lusitania sinking on U.S. entry into World War I here:
https://brainly.com/question/42532938
