Just ran across this data - and it is consistent across years (https://injuryfacts.nsc.org/state-data/motor-vehicle-deaths-by-state/).
But the pattern is clear: It is much more dangerous to drive in red states than blue, even when one controls for number of miles driven. I don't know what to make of it. Lower seat belt compliance is one factor. Rural roads, certainly.
But it's weird how clear the pattern is.
Link: https://personalinjurysandiego.org/topics/most-and-least-traffic-fatalities-in-america/