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Woodrow Wilson’s administration knew the Germans’ U-boat policy and was already warning Germany not to target civilian ships, and on May 1, the very day that passengers were boarding the Lusitania on its trip back across the Atlantic, the president told Americans that "no warning that an unlawful and inhumane act will be committed" could justify actually conducting the attack.
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Charles River Editors (The Titanic and the Lusitania: The Controversial History of the 20th Century’s Most Famous Maritime Disasters)