I doubt it's stress. It likely has more to do with adequate funding. ... you are much more likely to die than if it's 10-20 minutes away, regardless of economic status.
For all its faults, the healthcare system and its funding in the US does not explain the life expectancy numbers. Consider that Hispanic migrants are among the longest lived residents of the US. If you look at the data, you'll see the damage is done before people come in contact with the healthcare system.
- The U.S. has vastly higher rates of firearm-related homicides and suicides, motor vehicle accidents, and accidental drug overdoses.
- The U.S. suffers from higher rates of obesity, Type 2 diabetes, and early-onset cardiovascular disease. This is driven by systemic factors like the American built environment (car-centric, less daily walking) and highly processed dietary patterns.