The chart on the right compares four big English-speaking countries on a single measure: vocabulary test scores of five-year-olds. You’d expect that children of highly educated parents would do well and children of poorly educated parents would do badly. And you’d be right. On average, the children of poorly educated parents have both genetic and environmental disadvantages, so it’s no surprise that they do worse than average.
But in the United States they do a lot worse. The Pew chart is normalized so that children of middle-educated parents score in the 50th percentile and other children are compared to that standard. In Canada, the least-advantaged kids manage to score at the 37th percentile. In the United States they score at only the 27th percentile.
Now, it’s pretty unlikely that Canadian kids with low-educated parents are genetically unluckier than American kids with low-educated parents. Genes may account for some of the overall difference between rich and poor kids, but not for the difference between Canada and the U.S. That has a lot more to do with how we raise our kids and what kind of attention we give them at early ages. On that score, the United States does wretchedly. We simply don’t give our poorest kids a fair start in life.
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