It was a clear autumn day in Washington, DC on October 27, 1941, when President Franklin Roosevelt delivered his Navy Day speech to the American people. Halloween was later that week, but Adolf Hitler and his Wehrmacht war machine were scaring the administration. Roosevelt used his address to highlight the threat posed to the Western Hemisphere—America’s hemisphere—per the longstanding Monroe Doctrine. The Japanese surprise attack on Pearl Harbor was six weeks hence, and Americans were leery of getting involved again in Europe’s perennially bloody wars. Charles Lindbergh and the “America First” movement, which represented America’s isolationist current, objected to greater involvement. Roosevelt needed to make the case that the Nazi threat to America was real. He noted, earlier that month, that a German U-boat had attacked an American destroyer, the USS Kearny, causing eleven American combat fatalities. “America has been attacked,” Roosevelt declared. “The USS Kearny is not just a navy ship. She belongs to every man, woman and child in this nation. . . . Hitler's torpedo was directed at every American.”
Roosevelt left out the minor detail that the Kearny was busy raining down depth charges on a German U-boat when she was torpedoed. In case the attack on the Kearny wasn’t enough to convince skeptical Americans of Hitler’s devious transatlantic designs, Roosevelt pressed his point with further evidence: “Hitler has often protested,” Roosevelt continued, “that his plans for conquest do not extend across the Atlantic Ocean. But his submarines and raiders prove otherwise. So does the entire design of his new world order,” Roosevelt stated ominously. “For example, I have in my possession a secret map made in Germany by Hitler's government . . . of the new world order.”
“It is a map of South America and a part of Central America, as Hitler proposes to reorganize it . . . into five vassal states, bringing the whole continent under their domination . . . [including] our great lifeline—the Panama Canal. . . . This map,” Roosevelt thundered, “makes clear the Nazi design not only against South America but against the United States itself.”
In addition to millions of Americans tuning their radios in to Roosevelt’s revelations of Nazi treachery, the Germans were listening too. They vociferously denied the authenticity of Roosevelt’s map, but then again, it was marked “Geheim,” (Secret), so of course they would disown it, wouldn’t they? German propaganda minister Joseph Goebbels rejected FDR’s “absurd accusations.” In his estimation, this was a “grand swindle” intended to “whip up American public opinion.” The problem is that Goebbels was right. The map was a forgery. He didn’t know who the real authors were, but British intelligence did—because it was they.
Operating out of the forty-fourth floor of New York’s Rockefeller Center, the remit of the vanilla sounding British Security Coordination office was, in part, to get America into the war. The Roosevelt administration was already reaching across the Atlantic with all sorts of civilian and military aid, but it wasn’t coming fast enough during the dark days of the Blitz, and each new initiative to support the British was met with howls of indignation by the isolationists in Congress. Prime Minister Winston Churchill believed that the Americans would eventually get around to doing the right thing; they just needed a prod in the right direction—a prod in which the ends justified the means.
British intelligence recalled their previous success at stoking America’s ire for war when, in February 1917, desperately seeking American entry into the Great War, they passed the Americans the infamous Zimmermann Telegram , albeit with a phony cover story to hide the fact that they were routinely breaking American diplomatic codes. The Zimmermann Telegram, intercepted and decrypted by British codebreakers, offered a secret deal in which the Germans promised to return New Mexico, Arizona and Texas to Mexico if the latter would declare war on the United States in the event that Washington declared war on Germany.
In that instance, the British artfully used the telegram, authored by German foreign minister Arthur Zimmermann, to overcome characteristic American concern about foreign entanglements. President Woodrow Wilson was in a pickle. Just a year earlier, in the election of 1916, correctly sensing the national mood of nonintervention, he had run and won on the slogan, “He kept us out of war.” Now he felt that war might be inevitable, but how to reverse himself? A week after Wilson received the telegram from the British he authorized its publication in (or, in today’s vernacular, “leaked it to”) the media. It made the front page on March 1, 1917.
Notably, many Americans suspected the dark arts at play, assessing the telegram as a forgery. The wind was taken out of their conspiratorial sails when, two days later, none other than Arthur Zimmermann himself helpfully confirmed that his telegram was genuine. By the next month, America was at war. Not only did the British weaponize the explosive content of Zimmermann’s telegram, but Wilson used it to change tack as well, each to their own political ends.