Final answer:
Germany launched unrestricted submarine attacks against U.S. merchant ships in early 1917, which was true.
Step-by-step explanation:
The statement is true. In early 1917, Germany launched unrestricted submarine attacks against U.S. merchant ships. The Germans hoped to counter the threat posed by American food and material supplies to the Western Allies by sinking British and French ships transporting these supplies across the Atlantic. As a result of these attacks, pressure increased on President Wilson from various sources, leading to the eventual declaration of war by the United States.