“Inequality in self-reported happiness in the American population has actually declined.60 And though I find it distasteful, even grotesque, to celebrate declining Ginis for life, health, and education (as if killing off the healthiest and keeping the smartest out of school would be good for humanity), they have in fact declined for the right reasons: the lives of the poor are improving more rapidly than the lives of the rich.61” (Steven Pinker, Enlightenment Now)
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Need to look at this underlying data. Related to Happiness inequality in Americans has declined, Poverty vs Inequality

Happiness inequality in Americans has declined