U.S. stock markets closed lower as concerns over tariff impacts and the upcoming Federal Reserve meeting weighed heavily on investor sentiment. The Dow Jones fell by over 250 points, contributing to a broader sell-off in major indices including the Nasdaq and S&P 500, which also experienced declines of over 1%. In particular, shares of Nvidia and Tesla performed poorly, with Nvidia down more than 3% following the announcement of new AI superchips and a notable decline in Tesla stock as investors reacted to a price-target cut. Analysts warn of growing recession risks, while futures indicate a cautious start for the markets ahead of pivotal economic data and policy decisions from the Fed.