Bears refused to budge Thursday, a day after markets staged a suspect rally attempt. The Dow Jones Industrial Average joined other major equity indexes to the downside in the first hour of trading on the stock market today.

More than 150 years of back-tested data paints a clear picture of what may come next for Wall Street's major stock indexes.

Dow, S&P 500, and Nasdaq dropped as Trump's tariff threats and a looming U.S. government shutdown unsettled investors. The Dow fell 0.31% to 41,223.97, while the Nasdaq and S&P 500 also declined. Meanwhile,