Employer Wants Me To Travel To "do Not Travel" Zone. Wrongful Termination?

I work at a "work at will state" (texas). My employer wants me to travel to Tamulipas Mexico, which is a Level 4 on travel.state.gov "do not travel". I brought this up and stated that I was not willing to go, and I was threatened with being fired I dont go. Is this wrongful termination?

So i would like to add, though it may not change things, that the job in question is an Hourly technical position. That said, while the job description was that there would be out of state and yes out of country travel, there was no mention of any requirement to travel to any dangerous areas - nor was this in any way presented as a dangerous job. I am in no way supposed to be a freedom fighter and i have no interest in going to warzones.