Based on "How We Entered World War I," which detail explains why the sinking of the Lusitania led the United States to enter World War I?

The deaths of 124 U.S. citizens in the sinking made the attack especially important to the United States and helped turn public opinion against Germany. The correct choice is that 124 of the 1,195 passengers killed were from the United States. The other details describe the attack or its circumstances, but do not explain as directly why it affected the United States.

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