I’ll remain kind with “you know nothing of what you speak”.
Now, on the to other side. The US army is 562984 strong, discounting ALL natl. guard and reserve troops. Since there are a lot of Texans in the Army, and many many people who would refuse to shoot at fellow Americans, and the other theaters the US is engaged in, assume 30% of the US army paper-strength is committed. .30=168595.2 Mexico would not want to misss out on such a lovely opportunity to kickstart the reconquesta, so assume the Mexican army commits 25% of paper-strength. Mexican army=192000, .25=48000. Total=121075.2.
NOW, the air war. Mexico has about 360 aircraft of all types, 360*.25=90. US airforce has 2400 fighters, but many of those are natl guard.
Texas has one fighter squadron and recon squadron, discounting all other types such as comm, transport, etc, of which it has several.
All of this is roughly calculated with many unproven assumptions, and discounts logistics, transport, likely combat hotspots, areas of strategic importance, illegal immigrant subterfuge and terror attacks and the effects those might have, the likelihood of gorilla tactics on the part of Texas militia troops and the effect that would have, other states such as Arizona joining with Texas or, much stickier for the fedgov strategy, Alaska.
So what we are looking at...Is one incredibly bloody, destructive and likely vicious war, the outcome of which is far from predictable.
I just love mental wargames ;)