The Germans also sank seven U.S. merchant ships when they began ‘unrestricted’ submarine warfare. This immediately preceded our declaration of war.
The Lusitania was being used to transport war materials; some Americans who chose to ignore an explicit German warning were on board - reminds me a bit of the American peaceniks who went to Iraq to protect Saddam's facilities.
And let me help you with this one: The Germans also sank seven U.S. merchant ships when they began unrestricted submarine warfare. This immediately preceded our declaration of war followed Wilson's breaking of diplomatic relations.