Answer:
On May 6, the German government signed the so-called Sussex Pledge, promising to stop the indiscriminate sinking of non-military ships. ... Furthermore, no ship would be sunk before safe passage had been provided for the ship's crew and its passengers.
Step-by-step explanation:
The Sussex Pledge was a promise made by Germany to the United States in 1916, during World War I before the latter entered the war.