But uncertainty around Trump's tariff policy continues to grip Wall Street, and his trade war has only intensified this week. The president has vowed to respond to tariffs planned by the EU and Canada in response to US duties on steel and aluminum imports — most notably leading off Thursday by threatening a 200% tariff on imports of EU wines and spirits.

Follow all the latest U.S. market action for Thursday as stocks resume selloff and President Trump threatens more tariffs.

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