Why is American Life Expectancy So Low_

Why is American Life Expectancy So Low?
i am socked that you didn't mention the lack of affordable healthcare, and it's certainly the cause of the massive drop during the pandemic.
Notjustbikes made a great video about American cars, and how bad they are for safety. It's not the early driving age, it's the distance from the ground/low visibility, bad crumple zones and car centric design.

Americans: Make healthcare too expensive too use.
Eat like they have free healthcare.
Drive everywhere, don't walk or exercise.
Also Americans: Why are we dying young?
As a Gen Xer I am keenly aware of this phenomenon. I’ve actually seen more deaths this year than for the entirety of the pandemic. Depression underlies many of the risky behaviors you mentioned. Also it was incredibly difficult to manage any chronic conditions during the pandemic.