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A promise made by Germany to the United States in 1916, during World War I.
RMS Lusitania was a British ocean liner that was sunk on 7 May 1915 by a German U-boat.
A type of naval warfare in which submarines sink vessels such as freighters and tankers without warning.
The United States broke relations when it declared war on the United Kingdom during the War of 1812;
A secret diplomatic communication issued from the German Foreign Office