New York Times contributors Karl Russell and Eduardo Porter report that children living with one parent have been shown to perform significantly worse throughout their lives than those who grew up in a stable, two-parent family.

According to the U.S. Census Bureau, there are more children living without a father in the U.S. than in any other developed country, followed by Denmark and Britain. Last year, 20 million children lived with a single parent, which is more than double the 8.3. million that did in 1968.

Those living with two parents fell to 69%, or to 51 million from 60 million.

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