The Zimmermann Telegram, a secret message from Germany to Mexico during the First World War, ended the United States’ ...
CC0 Usage Conditions ApplyClick for more information. Online primary source: the coded message that proposed a German-Mexican alliance in World War I (and that helped to bring the U.S. into the war).
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Worse Than Signalgate

This article was featured in the One Story to Read Today newsletter. Sign up for it here. The most colossally stupid and historically consequential mismanagement of classified war plans in an ...