There are some undeniable truths about these statistics, that basically on some ways, Red states tend to be subsidized by Blue states. I have never really heard a satisfactory answer to that one.
States that have (or had) sufficient wealth to rationalize very generous welfare states because “we can afford it” have gone Democrat over time. States that can’t afford it and they know it tend to be Republican. The cycle repeats in states with strong economies and growing populations. We tend here on FR to say that the influx brings liberal thinking and ruins the state, and that’s true to an extent. But, it’s also a symptom of “affluenza,” they begin to believe that they can afford it and so Democrat policies begin to appear rational, whereas they were rejected before.