In 1915 the British blockade of Germany was fully implemented by the Grand Fleet. To counter the blockade the Germans launched a campaign of unrestricted submarine warfare, meaning that any ships around Britain, enemy or neutral, would be sunk in the hope of stopping the flow of supplies upon which the British were dependent on for their war effort. The German U-boat campaign culminated with the sinking of the Lusitania in which a large number of Americans died, sparking an outrage in the United States. Because they were unwilling to further provoke the Unite States, at least for the moment, the Germans were forced to put a moratorium on attacks on any liners without prior warnings.
Please support History Lapse by making a $5 donation (PayPal, credit card or bitcoin).