Final answer:
Woodrow Wilson declared war on Germany on April 6, 1917, following a series of provocations including unrestricted submarine warfare and the Zimmermann Telegram, despite initial efforts to maintain American neutrality.
Step-by-step explanation:
During his presidency, Woodrow Wilson faced the challenging task of maintaining American neutrality at the outset of World War I. However, the unfolding events made neutrality increasingly difficult. In February 1917, Wilson severed diplomatic relations with Germany because of their continued use of unrestricted submarine warfare. The discovery of the Zimmermann Telegram and the renewal of U-boat attacks escalated tensions, significantly influencing American public opinion towards war. Acknowledging the threat that a German victory posed to the balance of power in Europe and the democratic principles, President Wilson went before Congress on April 2, 1917, delivering a "War Message". After rigorous debate, reflecting concerns over American economic interests and underlying values, Congress officially declared war on Germany on April 6, 1917.