13 days later, the illusion shattered, as a German U-boat’s torpedo sank the Lusitania and brought America into the war. Not quite correct. There was such a th

13 days later, the illusion shattered, as a German U-boat’s torpedo sank the Lusitania and brought America into the war. Not quite correct. There was such a thing as 'The Zimmerman Telegram'. There were two years (half the length of WW1) between the sinking of the Lusitania in 1915 and the US declaration of war in 1917.