How did the united states interception of the zimmerman telegram impact its role in world war 1?

The telegram was supposed to be  a secret between the countries and it had a plan to attack. But when the US got a hold of it the plan was no longer secret therefor the enemy did not get the attack they had planned

Communicating with the dead was common, it wasn’t seen as bizarre or weird,” explains murch. “it’s hard to imagine that now, we look at that and think, ‘why are you opening the gates of hell? ’