Earlier quoted context omitted.
Getting a hold of Texas is a lot easier than getting a hold on pretty much anyplace in the MidWest. That's for sure. But it's irrelevant in modern warfare anyway. The right play is to just flatten most of our states outright. You don't fight hot wars with amphibious landings anymore. Hot wars between major powers would be over in a matter of hours these days.
Cities are beside the point. Occupying Texas (or admittedly the Midwest) would be like occupying Afghanistan or Iraq except the insurgents would have even more technicals and many of them would have US military training.
But again, completely irrelevant anyway, because total war means total war.
If it weren't for the fact that most of them would be dead at the time, I'd argue that people who think in terms of occupations would be disagreeably surprised after the next war between great powers. A pretty common mistake in military thought has always been "fighting the last war" so to speak.