German submarines began sinking unarmed and unresisting merchant and passenger ships without warning

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The German submarines began sinking unarmed and unresisting merchant and passenger ships without warning in retaliation for the British naval blockade of Germany, which was causing severe shortages and economic damage. This strategy, known as unrestricted submarine warfare, was meant to disrupt British supply lines and break their resolve, but it also drew the United States into the war after several American ships were sunk.

German Submarines Began Sinking Unarmed and Unresisting Merchant and Passenger