[lentulusgracchus]

Somewhat off-topic, but I’ve always thought the Zimmerman Telegram odd. They offered the Mexicans TX, AZ and NM but did not mention California.

I once read, in an old history of cryptanalysis, that the Zimmermann Telegram was a British forgery and roorback.

[Sherman Logan]

If it was, I’m unsure why the German ambassador to America admitted it was genuine.

I suspect what you’re thinking of is the fact that its discovery was a result of British spying and they concealed the way it was discovered to protect sources of intelligence.