may 7, 1915 - Lusitania sunk
Description:
 During the WWI Germany identified the Lusitania ship, a passenger liner,  and torpedoed it; it sank in 18 minutes and caused 1198 deaths. This was a wage of naval war against the UK. 
The Lusitania sinking caused a naval war between Germany and the UK, and also contributed to an earlier entrance of the Americas. 
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