The American dream—the proposition that anyone who works hard can get ahead, regardless of their background—has slipped out of reach in the minds of many Americans.

Only 36% of voters in a recent survey said the American dream still holds true. This is substantially fewer than the 53% who said so in 2012 and 48% in 2016 in similar surveys. When a Wall Street Journal poll last year asked whether people who work hard were likely to get ahead in this country, some 68% said yes—nearly twice the share as in the new poll.

The survey offers the latest evidence that Americans across the political spectrum are feeling economically fragile and uncertain that the ladder to higher living standards remains sturdy, even amid many signs of economic and social progress.