After its U-boats sank the Lusitania in 1915, what did Germany promise to do?

The United States eventually protested the action, and Germany apologized and pledged to end unrestricted submarine warfare. However, in November of that same year a U-boat sunk an Italian liner without warning, killing more than 270 people, including more than 25 Americans.

Explanation:Afraid that the U.S. might now enter the war on the side of the Allied Powers, the German government issued the Arabic Pledge in 1915. Germany promised that it would warn non-military ships thirty minutes before it sank them. This would allow passengers and crew time to escape safely on lifeboats.

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