May 22, 2013 | Volume 100 / Number 21

The Times Are Changing

On May 15, 2013, the headline for a news release from the United States Census Bureau stated, “International Migration is Projected to Become the Primary Driver of U.S. Population Growth for First Time in Nearly Two Centuries.”

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To understand what that means in English, one must first determine how population growth is calculated by the calculators who calculate these things. It's very simple, really. They take the number of births against the number of deaths recorded yearly. They call that “natural increase.”

But then the Census Bureau has to take into account how many immigrants...

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