As the first American merchant vessel lost to Germany’s aggression during the Great War, the
William P. Frye incident sparked the indignation of many in the United States. The German government’s apology and admission of the attack as a mistake did little to assuage Americans’ anger, which increased exponentially when German forces torpedoed and sank the British-owned ocean liner
Lusitania on May 7, 1915, killing more than 1,000 people, including 128 Americans. The U.S., under President
Woodrow Wilson, demanded reparations and an end to German attacks on all unarmed passenger and merchant ships. Despite Germany’s initial assurances to that end, the attacks continued.
In early February 1917, when Germany announced a return to unrestricted submarine warfare, the U.S. broke off diplomatic relations with the country. By the end of March, Germany had sunk several more passenger ships with Americans aboard and Wilson went before Congress to ask for a declaration of war on April 2, which was made four days later. The first American ships arrived in Europe within a week, marking a decisive end to U.S. neutrality.