Source of the chart - Plane vs. car safety: America has the world's safest air travel but is so bad at car safety - Vox
Three tweet thread...
A key reason is Americans love BIG HEAVY vehicles. "The average weight of a new vehicle sold in the United States last year was a whopping 4,329 pounds." You get hit by one of these monsters as a pedestrian, cyclist, you die.
I think this also has to due with the US healthcare system. I'd imagine a lot of people over there flat out couldn't afford to be saved after a car crash.