The nation’s middle class, long a pillar of the U.S. economy and foundation of the American dream, has shrunk to the point where it no longer constitutes the majority of the adult population, according to a new major study.

The Pew Research Center report released Wednesday put in sharp relief the nation’s increasing income divide, which is certain to be a central issue in the 2016 presidential race. It also highlights how various economic and demographic forces have eroded long-held ideals about maintaining a strong, majority middle class.

Read more in The New York Times.