[GlibMonkeyDeath]

This effect has been well studied, adjusting for wealth and ethnicity (e.g. black and white American vs. European, adjusting for poverty level here https://www.pnas.org/doi/10.1073/pnas.2104684118), or just 1-5% highest income Americans vs. European (https://pmc.ncbi.nlm.nih.gov/articles/PMC7770612/.)

In 1990, there was no difference in life expectancy between wealthy white Americans and comparably wealthy Europeans (Fig 3 in the first link) Since then a gap has opened up among all levels of income (even the wealthiest white Americans now have lower life expectancy than comparably wealthy Europeans.) The second link looks at the biggest death causes (heart disease and cancer being #1 and #2) and conclude Americans have worse outcomes for both of these conditions.

Basically, Europe continued to improve while America stagnated in life expectancy over this time.

Interestingly, even in 1990, comparably poor Europeans had longer life expectancy than white Americans. So this isn't exactly new, but it seems all of American life expectancy has been stagnating, and wealth can only mitigate this to a certain degree.