After the entry of the US into the war Germany decided its only hope for victory was to do what?

After the entry of the U.S. into World War I, Germany believed its only hope for victory lay in resuming unrestricted submarine warfare. This strategy aimed to cut off supplies to the Allies by targeting merchant and naval ships indiscriminately. Germany hoped that by inflicting significant economic damage, they could force a swift end to the war before American forces could fully mobilize and impact the battlefield. However, this decision ultimately contributed to increased U.S. involvement and helped shift the momentum in favor of the Allies.