Why did the US finally become persuaded to enter WWI ?

This is the Lusitania, the passenger boat that the German U-boats sank.
This is a German U-Boat

The US entered WWI because Germany sank a passenger ship and cargo ships. The Passenger ship that the German U-Boats sank was called the Lusitania. There was 1,959 people on board , 1,198 people died , and 128 Americans died. The Lusitania was briefly the biggest ship at that time Peroid.

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