To understand the fundamental benefits of an immigrant population, imagine that you could divide the population of any country into two groups: one consisting on the average of the youngest, healthiest, boldest, most risk-tolerant, most hard-working, ambitious, and innovative people; the other consisting of everybody else. Transplant the first group to another country, and leave the second group in their country of origin. That selective transplanting approximates the decision to emigrate and its successful accomplishment. Hence it comes as no surprise that more than one-third of American
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