Just ignore Portland, Seattle and the entirety of NorCal, along with Denver/Boulder, and a bunch of other large cities in what some call the "flyover" parts of the US.
Here’s a map: https://johnstonarchitects.files.wordpress.com/2012/04/pop_l...
[1]: I have to qualify it with "the parts I fly over" because obviously I'm flying over the southern part of the state. Head north and you start getting vast tracks of wilderness, and the upper peninsula is effectively not populated. There's just a few beads of "civilization" tied together by some fairly long roads, which are themselves most of the rest of the "civilization", and then it's square mile after square mile of wilderness.
So, yes, Texas is comparatively under-developed.
It fits a pattern that also fits Australia and Canada... people don't want to live as much where it is extremely dry, or extremely hot / cold.