Question

after its u - boats sank the lusitania in 1915, what did germany promise to do? stop fighting on the western front sign the treaty of brest - litovsk limit submarine warfare sink more passenger vessels

Explanation:

The sinking of the Lusitania by German U - boats in 1915 was a significant event. It led to international outcry, and Germany, under pressure, promised to limit submarine warfare to avoid further diplomatic and international relations issues.

Answer:

limit submarine warfare