You really want to bomb Houston into submission? Seriously? I wouldn't be able to stomach it. I have fucking friends in Texas.
No, and never.
I don't support bombing Texas, but I do support arresting people who shoot at federal officials, and that's exactly how it would go down, just like last time. There's no authority to secede from the Union. The federal government would just continue to do federal government stuff, and if state officials tried to resist them they'd be criminals, and would be arrested. If they resisted arrest with deadly weapons then that would be bad, but, like, what is even the point of having a state monopoly on violence if they're not going to use that monopoly to put other violence providers out of business?
I'm not saying that I want this to happen, I just don't think this question is a live one. If 99% of Texans voted to secede, maybe. With a bare majority? No chance. America's still responsible for the well-being of its citizens.
On an antebellum note, I do want to respond to the discussion about anti-immigration policies and xenophobia but I need to collect my thoughts.
I generally agree that there is a fundamental problem in the global economy right now in that we're in the middle of another Gilded Age, and that that's creating no small amount of stress and pain for people who aren't gilded, which is leading to reactionary impulses. I even mostly agree with sphagnum that the theoretical response to this issue is socialism (or at least social democracy). The other alternative is, you know, an international worker's revolution, and I don't want to do that until we have self-driving cars figured out or it will take forever to get them working.
However I still don't think recognizing those economic concerns should outweigh recognizing that the reactionary impulses being generated are reactionary impulses! Being a racist because of economic factors that are affecting your life is not that much better than being a racist because of societal upbringing or because of the subreddits you frequent. It's still bad to be racist!