Indeed, Germany’s decision to recommence unrestricted submarine warfare in February was one of the decisive factors driving the United States, and later Brazil, into finally joining “the war to end all wars.” Navy was clear: it needed to transport and supply over a million men across the Atlantic despite the Imperial German Navy’s ferocious U-Boat campaign, which reached its peak that month, sinking over 874,000 tons of shipping.
World War I and How the US Navy Waged War on U-Boats: When Congress voted on Apto declare war on Imperial Germany, the task before the U.S.
