NPR:

Americans have long lived in a nation made up primarily of middle-class families, neither rich nor poor, but comfortable enough.

This year, that changed, according to the Pew Research Center.

A just-released analysis of government data shows that as of 2015, middle-income households have become the minority. The trend is so firmly established that it may well continue; Americans have experienced “a demographic shift that could signal a tipping point,” Pew researchers concluded Wednesday.

Thanks to factory closings and other economic factors, the country now has 120.8 million adults living in middle-income households, the study found. That compares with the 121.3 million who are living in either upper- or lower-income households.