Underperformance in Affluence: The Remarkable Relative Decline in U.S. Heights in the Second Half of the 20th Century
Source: Social Science Quarterly

Results.
U.S. heights stabilized at mid-century and a two-decade period of stagnation set in with the birth cohorts 1955–1974, concurrent with continual rapid increases in heights in western and northern Europe. Americans had been the tallest in the world for (more than) two centuries until World War II, but by the end of the 20th century fell behind many European populations. Only since the most recent birth cohorts 1975–1983 is some gain apparent among whites but not among blacks. The relationship between height and income and between height and educational attainment has not changed appreciably over time for either men or women.

Conclusion.
We conjecture that the U.S. health-care system, as well as the relatively weak welfare safety net, might be why human growth in the United States has not performed as well in relative terms as one would expect on the basis of income alone. The comparative pattern bears some similarly to that of life expectancy insofar as the United States is also lagging behind in that respect.

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