When Mother's Day became a national holiday in the U.S. more than a century ago, women were a relative rarity in the workforce. Today's mom, by contrast, is largely a working mom. 

In half of American households, women are either the primary breadwinner or contribute more than 40 percent of the income. For most families, the added income from women going to work is the only thing that's kept family income steady, as individual worker wages have stagnated for the better part of four decades.

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