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German declaration of war on the United States

1941 German war declaration

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Through Nazi Germany, World War II and Adolf Hitler

The formal declaration was made by Ribbentrop in his office to American Chargé d'affaires Leland B. Morris. That same day, Benito Mussolini announced Italy's declaration of war on the United States the U.S. declared war on Germany. Germany's declaration eliminated any remaining meaningful domestic isolationist opposition to the U.S. joining the European war.

Background

The course of relations between Germany and the United States had deteriorated since the beginning of World War II, largely because of the increasing cooperation between the United States and the United Kingdom. The Destroyers for Bases Agreement, Lend-Lease, the Atlantic Charter, the hand-over of military control of Iceland from the United Kingdom to the United States, the extension of the Pan-American Security Zone, and many other results of the special relationship which had developed between the two countries had put a strain on relations between the United States, still technically a neutral country, and Germany. United States warships escorting American supply vessels bound for the United Kingdom bearing aid were already engaged in an undeclared de facto war with German U-boats. Roosevelt's desire to help the British, despite the objections of the influential American isolationist lobby, and the Neutrality Acts imposed by Congress which prevented direct involvement in the war, brought the U.S. to push hard against the traditional boundaries of neutrality to prevent the Axis domination of Europe. By 1941, much of the Neutrality Acts had largely been repealed by the Lend-Lease Act, allowing Roosevelt more freedom to pursue further aid for Britain without legal impediments. Even before the Battle of France in 1940, American public opinion towards Germany had become increasingly hostile, particularly after Roosevelt won another election term in 1940.

On 7 December 1941, Japanese forces launched a surprise attack on the United States Pacific Fleet based at Pearl Harbor, Hawaii, heralding a war between Japan and the United States. Japan had not informed its ally, Germany, in advance of the attack, although the Japanese ambassador had communicated to the German Foreign Minister, Joachim von Ribbentrop, at the beginning of December that relations between the United States and the Japanese Empire had deteriorated to a point where hostilities were imminent. He was thereafter instructed to ask Germany for a commitment to declare war under the terms of the Tripartite Pact should that occur. Hitler and Ribbentrop had been urging Japan to attack and seize Singapore from the British, believing that doing so would not only harm the British cause, but would also serve to help keep the U.S. out of the war. Japanese leaders, including Hideki Tojo, were concerned that an attack on the United States would cause Germany to side with their racial kin and participate in an encircling of Japan with the United States and Britain. Therefore, the Japanese side urged for confirmation of German and Italian allegiance with Japan. On 28 November 1941, Ribbentrop confirmed to Hiroshi Ōshima, the Japanese ambassador to Germany, what Hitler himself had told Japanese foreign minister Yōsuke Matsuoka: that if Japan became embroiled in a war with the United States, Germany would, naturally, enter the war on Japan's side. When the Japanese asked for a written assurance of this, Hitler complied, with express consent from Mussolini. This agreement, drafted on 4 December, committed the primary Axis powers to go to war with the United States in the event of hostilities with Japan, and essentially superseded the Tripartite Pact as an offensive, rather than defensive, alliance.

According to the terms of their agreements, Germany was obliged to come to the aid of Japan if a third country attacked Japan, but not if Japan attacked a third country. Ribbentrop reminded Hitler of this, and noted that a declaration of war against the United States would add to the number of enemies Germany was fighting, but Hitler dismissed this concern as not being essential to the outcome of the war, and, almost entirely without consultation, declared war against the United States. Hitler sought to preempt what he believed was an imminent declaration of war by Roosevelt, even though Roosevelt had not planned to declare war on Germany. In general, the Nazi hierarchy held low regard for the military resolve of the U.S. under Roosevelt, a stance that is widely considered a major error in their strategic thinking. In their eyes the United States was a corrupt, decadent, Jewish-dominated nation weakened by its large populations of African Americans, immigrants, and Jewish-Americans.

American public opinion swung heavily against Germany after Pearl Harbor, which was believed to be inspired by or organized by Germany. A 10 December Gallup poll (after Pearl Harbor but before the German declaration of war) found that 90% of Americans answered "Yes" to the question "Should President Roosevelt have asked Congress to declare war on Germany, as well as on Japan?"

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