How did the sinking of the Lusitania in 1915 affect World War I?

The German submarine attack on the Lusitania killed nearly 1,200 people, including 128 Americans, causing strong international outrage. In response to protests, Germany temporarily restricted submarine attacks on passenger and merchant ships. The United States did not declare war until 1917, so A, “Germany restricted its submarine warfare in response to international outrage,” is correct.

AI-written and checked against the verified answer.