Wilson Declares War: America Enters World War I

Woodrow Wilson had won reelection in 1916 on the slogan "He kept us out of war." Five months later, he stood before a joint session of Congress and asked for a declaration of war against Germany. The reversal was total, driven by Berlin's decision to resume unrestricted submarine warfare and the exposure of the Zimmermann Telegram, in which Germany offered Mexico an alliance against the United States. Wilson framed the conflict not as a territorial dispute but as a crusade: "The world must be made safe for democracy." Germany's submarine campaign had been sinking American merchant ships and killing American citizens for two years. Wilson had responded with diplomatic protests and the policy of "armed neutrality," allowing merchant vessels to carry weapons but stopping short of belligerence. When Germany announced in January 1917 that it would sink any vessel in the war zone without warning, Wilson broke diplomatic relations but still hesitated. The Zimmermann Telegram, intercepted by British intelligence and published in American newspapers on March 1, destroyed any remaining appetite for neutrality. Wilson delivered his War Message on April 2, 1917, telling Congress that Germany's actions constituted "nothing less than war against the government and people of the United States." He took pains to distinguish between the German government and the German people, declaring "We have no quarrel with the German people. We have no feeling towards them but one of sympathy and friendship." Congress voted for war on April 6 by overwhelming margins: 82 to 6 in the Senate, 373 to 50 in the House. Jeannette Rankin of Montana, the first woman elected to Congress, voted no. American entry transformed the war. The United States raised a four-million-man army through conscription and placed it under General John J. Pershing, who insisted on fighting as an independent force rather than feeding troops into depleted British and French units. American industrial capacity flooded the Western Front with supplies, equipment, and fresh divisions at the precise moment Germany's spring 1918 offensive was exhausting its last reserves. Wilson's democratic crusade rhetoric shaped the postwar settlement and planted the ideological seeds for American foreign policy throughout the twentieth century.