The average height of American men has stayed the same over the past 50 years, while average heights in other countries (for example, Denmark) have increased. Height is a classic quantitative trait. Provide both a genetic and environmental hypothesis for why the height of the American population is not increasing along with other countries.

The average height of American men has stayed the same over the past 50 years, while average heights in other countries (for example, Denmark) have increased. Height is a classic quantitative trait. Provide both a genetic and environmental hypothesis for why the height of the American population is not increasing along with other countries.
Please answer in your own words.

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