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,

Futures rose as government shutdown fears waned after the S&P 500 hit a six-month low Thursday amid fresh Trump tariff threats. Warren Buffett's Berkshire rose within a buy zone.