As stated in the post, how red or blue the states are were determined solely on the 2020 Election and are relative to other States. If you have a link which provides a broader view on how liberal/conservative the States are compared to one another over the last decade or so, I would welcome the input. Anybody with an ounce of intellectual honesty, though, would be hard pressed to demonstrate that Kentucky, Mississippi, Louisiana, or Arkansas were bastions of liberalism at any point in recent history. A significant portion of the Democrats in these legislatures when they did have a majority were likely Manchinesque and/or remnants from the age of
Dixiecrats.
Furthermore, even if you buy into the idea that liberalism is to blame for the condition of these States, is Republican leadership in them so lacking that they can't turn things around after several years and get out of being the bottom feeders in even a few of the myriad of categories that they find themselves lacking in? Kentucky was the most recent (2016) of the states you listed where Democrats had a majority in only one of their state legislative bodies (with a Republican governor, nonetheless). You have to go back to 2000 to find a time when Democrats controlled both legislative bodies and the governorship there. In most of the States you listed, Republicans have had plenty of time to dig themselves out of being the shitholes that they are, but instead their crappy policies just drive them further into the ground, where they will likely remain.
It's all just data, though. You can try do dance around it all you like, but the simple fact is that red states statistically inhabit the echelons of lower performing states and blue states are primarily those on top. There are a few categories that red states fare better in, such as unemployment, homelessness, and debt, but overall they kinda suck.
I looked up another couple of statistics today - Average lifespan and obesity rates. No surprises where red and blue states fell in each of these, either. If you have any other statistics that you think I should add to the list, I am open to input.