This is more like Texas seceding on good terms, then after a couple of years a communist coup happens and the new Texas president joins the Latin American Nuclear Defense Organisation aimed against the US and supressess the non-Hispanic population of Texas prompting a small civil war within Texas by people not wanting to be part of a pro-Latin American government, and then the US helping and ultimately invading the parts of Texas that was never part of Mexico ever and then Mexico calling that a full-scale invasion of Texas that must be defended at all cost.
This is more like Texas seceding on good terms, then after a couple of years a communist coup happens and the new Texas president joins the Latin American Nuclear Defense Organisation aimed against the US and supressess the non-Hispanic population of Texas prompting a small civil war within Texas by people not wanting to be part of a pro-Latin American government, and then the US helping and ultimately invading the parts of Texas that was never part of Mexico ever and then Mexico calling that a full-scale invasion of Texas that must be defended at all cost.