Name two ships sunk by Germany submarines which led to war with us?

the Lusitania was a british passenger liner that had Americans on board when she was sunk, not sure of another one. the zimmerman note was also a major cause. In it, the Germans attempted to convince Mexico to attack the united states from the south in order to create another front. the US was still neutral at the time the note was sent but they did not stay that way for long.