"Democrats always hit 45% in South Carolina, but they never cross it because that's the threshold" ignores the fact that there's been a lot of variability in vote margins across counties...they just tend to cancel each other out! Here's the elasticity of the state from 2014-2020. 
Something interesting, though, is that these changes appear to have stabilized a lot from 2016 onwards -- looking *only* at elections from 2016-20, we see that margins have begun to settle in. So a blue SC is some ways away. But Cunningham's district? That's perpetually close now
I think @kilometerbryman, @SenhorRaposa, and @JMilesColeman have talked about this in more detail with some of their maps and stats, but another classic case of this is Wisconsin. Close in 2004 (D+0.4), close in 2020 (D+0.6)...but with maps that look absolutely *nothing* alike.
(i made the south carolina maps, but in case it isn't obvious, the wisconsin maps are from wikipedia LOL)
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