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On April 2, 1917, President Woodrow Wilson went before a joint session of Congress to request a declaration of war against Germany. Wilson cited Germany’s violation of its pledge to suspend unrestricted submarine warfare in the North Atlantic and the Mediterranean, as well as its attempts to entice Mexico into an alliance against the United States, as his reasons for declaring war. On April 4, 1917, the U.S. Senate voted in support of the measure to declare war on Germany. The House concurred two days later. The United States later declared war on German ally Austria-Hungary on December 7, 1917.

Germany’s resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson’s decision to lead the United States into World War I. Following the sinking of an unarmed French boat, the Sussex, in the English Channel in March 1916, Wilson threatened to sever diplomatic relations with Germany unless the German Government refrained from attacking all passenger ships and allowed the crews of enemy merchant vessels to abandon their ships prior to any attack. On May 4, 1916, the German Government accepted these terms and conditions in what came to be known as the “Sussex pledge.”

Despite the shocking news of the Zimmermann Telegram, Wilson still hesitated asking for a declaration of war. He waited until March 20 before convening a Cabinet meeting to broach the matter—almost a month after he had first seen the telegram. The precise reasons for Wilson’s decision to choose war in 1917 remain the subject of debate among historians, especially in light of his efforts to avoid war in 1915 after the sinking of the British passenger liners Lusitaniaand Arabic, which had led to the deaths of 131 U.S. citizens.

However, by 1917, the continued submarine attacks on U.S. merchant and passenger ships, and the “Zimmermann Telegram’s” implied threat of a German attack on the United States, swayed U.S. public opinion in support of a declaration of war. Furthermore, international law stipulated that the placing of U.S. naval personnel on civilian ships to protect them from German submarines already constituted an act of war against Germany. Finally, the Germans, by their actions, had demonstrated that they had no interest in seeking a peaceful end to the conflict. These reasons all contributed to President Wilson’s decision to ask Congress for a declaration of war against Germany. They also encouraged Congress to grant Wilson’s request and formally declare war on Germany.

* Republished from [https://history.state.gov/| Office of the Historian, United States Department of State]

* Article: [https://history.state.gov/milestones/1914-1920/wwi| U.S. Entry into World War I, 1917]

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