Women are the primary wage earners in 40% of U.S. households that include children -- a record tally, according to data from the Pew Research Center. "This change is just another milestone in the dramatic transformation we have seen in family structure and family dynamics over the past 50 years or so," said Pew's Kim Parker. The change appears to be the result of short- and long-term trends such as declining marriage rates, economic turbulence and heightened educational attainment among women.

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