CVD mortality stagnation after 2010 affects all income levels including the wealthiest counties indicating structural system failure not poverty correlation

The pervasive nature of CVD mortality stagnation across all income deciles—including the wealthiest counties—demonstrates this is a structural, system-wide phenomenon rather than a poverty-driven outcome. While county-level median household income was associated with the absolute level of CVD mortality, ALL income deciles experienced stagnating CVD mortality declines after 2010. This finding is crucial because it rules out simple socioeconomic explanations: if CVD stagnation were primarily driven by poverty, inequality, or lack of access to care, we would expect to see continued improvements in affluent populations with full healthcare access. Instead, even the wealthiest counties show the same pattern of flattening mortality improvements. This suggests the binding constraint is not distributional (who gets care) but structural (what care is available and how the system operates). The fact that nearly every state showed this pattern at both midlife (ages 40-64) and old age (ages 65-84) reinforces that this is a civilization-level constraint, not a regional or demographic phenomenon.