In the age of rising income inequality, the task of preserving America’s middle class has been taken on by politicians across the ideological spectrum. A new reportfrom Pew Research Center shows just how much the economic fortunes of this group have changed since the 1970s.

In every decade since then, the percentage of adults living in middle-income households has fallen, according to Pew, which is based in Washington. The share now stands at 50 percent, compared with 61 percent in 1971.

This matters because  the "state of the American middle class is at the heart of the economic platforms of many presidential candidates ahead of the 2016 election," Pew researchers Rakesh Kochhar and Richard Fry wrote in their report. Meanwhile "a flurry of new research points to the potential of a larger middle class to provide the economic boost sought by many advanced economies."

Pew defines a middle-class household as one having income that is two-thirds to double that of the overall median household income. A family of three, for instance, would need to have a minimum income of $41,869 to qualify as middle-income.

Here’s more data on how America’s middle class has morphed over the last few decades: They're no longer the majority

Being a member of the middle-class has long been treated as an American badge of honor. However middle-income households have lost their majority status in the U.S, with the size of their counterparts on opposite ends of the income spectrum overtaking them in number.

Some 120.8 million adult Americans lived in middle-class households this year, according to Pew. That’s slightly less than the combined number of upper-income adults (51 million) and those at the lower tier (70.3 million).Their income gains are smaller

While households across the spectrum have seen higher earnings over the past several decades, upper-income households have seen their pay rise the most.

The median income of those families was $174,625 in 2014, up 47 percent since 1970, Pew data show. That compares with a 34 percent gain for the middle class and a 28 percent increase for the poorest households.

Households of all income levels got hit hard during the recession, resulting in earnings declines between 2000 and 2014.Blacks are least likely to be middle-income

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