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Nov 7, 2014, 3:07 pm36 pts
MNN
The U.S. population has grown by more than 50 percent since 1970, adding about 2.6 million people per year for four decades. The economy has also mushroomed during the same period, with the country's gross domestic product rising by 218 percent, from less than $5 trillion to more than $15 trillion. Yet…
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