What about the US fighting Mexico for their own reasons and with no reference to the telegram and Germany, is that possible?
So if the telegram isn't intercepted does the US keep interfering in Mexico and possibly go to war in Mexico much like their other interventions in Latin America in the era without the telegram focusing their attention onto Germany? Do the Mexicans burn their oilfields as a result and do the British go ballistic because of that?
If I remember correctly by the time the telegram arrived the US had already withdrawn/was withdrawing. The intervention had been anything but successful and I don't think there was any appetite to continue.What about the US fighting Mexico for their own reasons and with no reference to the telegram and Germany, is that possible?
Well, given the invasion of Veracruz, the Punitive Expedition, and everything that had gone on since Taft massed troops on the border to contain the Revolution... it's entirely possible. There were some banging the drum for a war -- Hearst was the loudest voice, but not the only one. Wilson, Bryan, and Lansing were hell-bent on avoiding a war in Mexico; it's entirely possible that a different administration (possibly Taft or Roosevelt) would have seen it differently.
Also, Britain not intercepting the telegram is very, very improbable.
The telegraphic cables went through Britain, and they read EVERYTHING the Germans sent. IIRC.