The overall study period covered five presidential elections from 2000 to 2019 and included data for 99.8% of the US population.
Between 2001 and 2019, mortality rates decreased by 22% in Democratic counties (from 850 to 664 per 100,000), but by only half that (11%) in Republican counties (from 867 to 771 per 100,000).
Consequently, the gap in mortality rates between Republican and Democratic counties jumped by 541%, from 16.7 per 100,000 in 2001 to 107 deaths per 100,000 in 2019.
Basically, the death rates of both Democratic and Republican counties have overall decreases since 2001, but Republican death rates decreased 11% less than those in Democratic counties.
It's almost as if, despite the medical process in the almost 20 year time span, the gun-totting, horse medicine-hocking, crazy people afraid of radio signals end up more dead than their counterparts who don't do that kind of stuff.