Wall Street’s sell-off is kicking back into gear on Thursday, and a U.S. stock market rattled by uncertainty about the economy and President Donald Trump's tariffs is nearly all the way back to where it was on Halloween.

The S&P 500 tumbled 1.8% to resume its slide after a mini-recovery from the prior day clawed back some of its sharp drop over recent weeks. The Dow Jones Industrial Average dropped 427 points, or 1%, and the Nasdaq composite sank 2.6% to finish more than 10% below its record set in December.

Any kind of uncertainty around the economy will give Wall Street pause. These tariffs have had a particularly jostling effect because no one knows how long Trump will go through w