To decode the text "VXVDX DVDDF AFDXG XGDDG AVFDV," it seems like you might be coding it using a simple substitution cipher or a Caesar cipher.
The Zimmerman note, or Zimmermann telegram, was a secret diplomatic communication sent by the German Empire to Mexico during World War One, proposing a military alliance against the United States.
However, without knowing the exact method of encoding, it's difficult to decode it accurately. If you have additional information about the cipher used (like a shift number or substitution key), please share that, and I'd be glad to help with the decoding!