State governments enjoy widely varying levels of trust. That’s the finding of a new Gallup poll summarized by Breitbart’s Joel B. Pollak on April 7

Illinois rests at the bottom of the trust heap with a trust deficit of 42 percent. North Dakota is tops with 56 percent more of its residents trusting state government than distrusting. Texas is 6th with a trust surplus of 45 percent and sits alone among the 10 most populous states in the top 10 for trust. The big states joining Illinois with trust issues are Pennsylvania (4th-least trusted), California (6th-least trusted), and North Carolina (9th-least trusted).

But why does trust vary so much? Is trust mainly driven by the number of governor who went to prison? Or, is trust linked to the number of people in a state, as Gallup found, “In general, trust is lower in more populous states than in less populous states…”.

The real answer may be more complex than suggested by Gallup–and more driven by good public policy.

Gallup’s state government trust map (below) resists any obvious linkages to demographics or other measurable factors.

So, what factors might correlate to trust in state government? (Of course, correlation doesn’t prove causation.) The factors are listed in increasing level of correlation:

Weak to no correlation to trust in state government

Slight correlation to trust in state government

Moderate correlation to trust in state government

Strong correlation to trust in state government

Gallup opined that population, the state of the economy and public corruption cases drove trust. But the above correlations show that the economy or the population only show a slight correlation to public trust, at 7.8 percent and 6.1 percent, respectively.

What does build trust? Liberty, thrift, roads, and a sound legal environment for a start–that and not seeing a bunch of elected officials go to prison.

The Hon. Chuck DeVore is the Vice President of Policy at the Texas Public Policy Foundation. Follow him on Twitter @chuckdevore