The aim of this article is to reconsider the motives of Germany's declaration of war on the United States by examining the talks between Japan and Germany over the conclusion of the “no-separate-peace” treaty in November/December 1941.
The Japanese cabinet led by Hideki Tojo was on the one hand making its last efforts to conclude some agreement with Washington, but on the other preparing to re-approach Germany in case the negotiation across the Pacific broke up. In late November Japan asked Germany unofficially if they would conclude a treaty, that prohibited making a separate peace with Britain or the United States, and if it would open war against the United States in case Japan entered first.
Although there is no document that shows directly how Hitler reacted to this Japanese inquiry, telegrams in the Magic documents and in the archive of the Japanese foreign ministry suggest that Hitler began to take a hard posision against the United States on November 28 at the latest.
Hitler did not declare war, however, immediately after Japan attacked Pearl Harbor on December 7. It was because he wanted to wait for the “no-separate-peace” treaty to be concluded in order to give “a good impression” to the German people by announcing it on the same day as declaring war on the United States. Japan was anxious about this German delay of declaring war, but the Japanese did not consider the German co-entry into war as their essential condition of starting the war against the United States.
In a series of meetings of the Liaison Conference between the government and armed forces preceding the Pearl Harbor attack, they discussed the question case Germany should ask Japan to take part in the war against the Soviet Union in return for their entry into war against the United States. They had concluded that if Germany brought up this question, they would give up concluding the treaty with Germany. Some historians still regard Japan's bold action was encouraged by Germany's pre-assurance on their co-entry into war with the United States, but Japan, especially the navy, did not calculate Germany's co-entry as a neccesity.
For Germany, declaration of war on the United States was not suicidal, nor a part of Hitler's aggressive war plans. Hitler went into war with the United States because the war seemed unavoidable, and also because Japan, whose war potential was over-estimated by the German Navy, was at Germany's side this time unlike the situation in the First World War.
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