A plurality of those are in Texas, as well. I used to say, someone in the US is more likely to die in a car wreck in Texas even if they never go to Texas, that's how skewed they make the statistics. But I stopped looking at the stats a few years ago so I stopped saying and defending that. It's just a new lens to view this information through.
Texas has a plurality of fatal car accidents (for USA), but California is not far behind, and in 2022 California has slightly more deaths. (This page doesn't have the number of fatal car accidents for 2022, which is a bit odd.)
You're not looking at absolute numbers, which is what plurality means. I don't see how "someone in the US is more likely to die in a car wreck in Texas even if they never go to Texas" could make sense.
A driver in the US dies while driving due to a crash/wreck/whatever.
Statistically, that occurred with the highest probability in TX. as i said, this was like 2015-2019 when i used to claim this. There's a sign on freeways in TX that say "highway deaths so far in <year>: <16 bit int>" which led me to start looking in to it, and i think my little quip is just a way to draw attention to how dangerous it is to drive in TX. But it is quite large, Texas.
Car wrecks are correlated with all kinds of things from education to poverty and Mississippi is dead last or tied for last in every dimension of quality of life.
also the roads outside of the interstates and US highways are pretty awful, in my (limited) experience driving in MS. one time we had to brake from 60 because a cow was on a bridge over an interstate.