Ok, I fear this may border on GD, but I’ll put it here and trust in the mod’s judgement.
The Zimmermann telegraph, if you don’t know what it is, was a telegraph supposedly sent, during World War I by Germany to Mexico. It invited Mexico to go to war with the US (which was neutral at that point) and take back the territory the US had taken from them. Although this was not the cause for World War I, it “made it easier” for the US.
My suspicion (which my history teacher agrees with) is that the British or French forged it in order to get the US involved in the war. A Mexican attack on the US would have failed and Germany would have gained nothing, since the US was netral at that point. It seems too obvious and too “looking for trouble.”
Is there any evidence as to whether or not my suspicion is correct?