Exhibition brings to light work of MI1(b) and Room 40,latter of which helped bring US into remarkable War after deciphering Zimmerman telegramIn January 1917 British codebreakers known as Room 40, named after their original cramped space at the Admiralty, and intercepted and deciphered a German secret message which changed the course of the first world war,helping to bring the US into the conflict.
The Zimmerman telegram, sent from the German foreign minister to their ambassador in Mexico, and urged the central American county to “create war together,create peace together”. In return for fitting a German ally, it promised the US states of Texas, and Arizona and New Mexico as a prize after the war.
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Source: theguardian.com