On March 1, 1917, the American public learned about a German proposal to ally with Mexico if the United States entered the war. Months earlier, British intelligence had intercepted a secret message from German Foreign Minister Arthur Zimmermann to the Mexican government, inviting an alliance (along with Japan) that would recover the southwestern states Mexico lost to the U.S. during the Mexican War of 1846-47. The secret to the British interception began years earlier. In 1914, with war imminent, the British had quickly dispatched a ship to cut Germany’s five trans-Atlantic cables and six underwater cables running between Britain and Germany. Soon after the war began, the British successfully tapped into overseas cable lines Germany borrowed from neutral countries to send communications. Britain began capturing large volumes of intelligence communications. British code breakers worked to decrypt communication codes. In October of 1914, the Russian admiralty gave British Naval Intelligence (known as Room 40) a copy of the German naval codebook removed from a drowned German sailor’s body from the cruiser SMS Magdeburg. Room 40 also received a copy of the German diplomatic code, stolen from a German diplomat’s luggage in the Near East. By 1917, British Intelligence could decipher most German messages.
What led to the proposal of alliance to Mexico? Zimmermann sent the telegram in anticipation of resumption of unrestricted submarine warfare, an act the German government expected would likely lead to war with the U.S. Zimmermann hoped tensions with Mexico would slow shipments of supplies, munitions, and troops to the Allies if the U.S. was tied down on its southern border. Some suspected the telegram might be a forgery to manipulate America into the war. However, on March 29, 1917, Zimmermann gave a speech in the Reichstag confirming the text of the telegram and so put an end to all speculation as to its authenticity. The Zimmermann Telegram galvanized American public opinion against Germany once and for all. The telegram was considered perhaps Britain’s greatest intelligence coup of World War I and, coupled with American outrage over Germany’s resumption of unrestricted submarine warfare, was the tipping point persuading the U.S. to join the war. Español In January 1917, British cryptographers deciphered a telegram from German Foreign Minister Arthur Zimmermann to the German Minister to Mexico, Heinrich von Eckhardt, offering United States territory to Mexico in return for joining the German cause. This message helped draw the United States into the war and thus changed the course of history. Read more... Primary SourcesLinks go to DocsTeach, the online tool for teaching with documents from the National Archives. Teaching Activities
The Zimmermann Telegram on DocsTeach asks students to analyze the telegram to determine if the United States should have entered World War I based on the telegram's information and implications.
In this Decoding a Message exercise, students decode a fictitious message using a simple substitution code. Additional Background InformationBetween 1914 and the spring of 1917, the European nations engaged in a conflict that became known as World War I. While armies moved across the face of Europe, the United States remained neutral. In 1916 Woodrow Wilson was reelected President for a second term, largely because of the slogan "He kept us out of war." Events in early 1917 would change that hope. In frustration over the effective British naval blockade, Germany broke its pledge to limit submarine warfare on February 1, 1917. In response to the breaking of the Sussex pledge, the United States severed diplomatic relations with Germany. Several weeks later, on February 24, the British presented the Zimmermann telegram to the U.S. Government in an effort to capitalize on growing anti-German sentiment in the United States. The American press published news of the telegram on March 1. On April 6, 1917, the United States Congress formally declared war on Germany and its allies. The Zimmermann Telegram had such an impact on American opinion that, according to David Kahn, author of The Codebreakers, "No other single cryptanalysis has had such enormous consequences." It is his opinion that "never before or since has so much turned upon the solution of a secret message. This text was adapted from the article "The Zimmerman Telegram" by Mary Alexander and Marilyn Childress. Citation: Alexander, Mary and Marilyn Childress. "The Zimmerman Telegram." Social Education 45, 4 (April 1981): 266 |
The Zimmerman telegram was part of an effort to
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