Answer is simple:
Demographics
DID YOU KNOW?
Texas has the nation’s largest rural population, with more than 3.6 million rural residents in 2000*.
Texas is one of the fastest–growing states in the nation. Since 2000, the state’s population has increased by 12.7 percent, nearly twice that of the nation (6.4 percent).1
http://www.window.state.tx.us/specialrpt/tif/population.html
Population growth shouldn't necessarily result in debt. Presumably, the revenue base should also increase. I'm sure Texas has at least as bad if not a worse problem with Illegal Border Crossers as we have here in California so it stands to reason that's part of the problem.
But it comes back to where the spending originates. Obviously, Federal spending originates in The House which has been dominated by RATS over the last 5 years or so. And it's been in the last 5 years that the debt has gotten out of hand.
I'm just curious as to where the spending originates in Texas, legislatively speaking, and who has been running the Texas legislature over the last few years as compared to the last 10.