Wall Street suffers worst day in 19 months as AI stocks plunge

Wall Street sold off sharply on Thursday, with the Dow Jones falling over 1,800 points and the Nasdaq 100 dropping more than 6% — its worst single-day fall since March 2020. Fears of a clampdown on AI expansion and data center buildout after Democrats won control of Congress drove the sell-off. The Nasdaq 100 lost $2.3 trillion in market value, a record single-day erosion.