President Donald Trump's tariff policies have triggered a significant sell-off in the U.S. stock market, wiping out $4 trillion in market value from the S&P 500's peak last month. This marks an 8.6% decline from the index's February 19 record high, with the Nasdaq dropping 4% and the Dow falling by 890 points. Investors are increasingly concerned about the economic implications of Trump's tariffs, which include potential inflationary pressures and retaliatory measures from major trading partners such as Canada, Mexico, and China. The tech sector has seen a 4.3% decline, with Tesla shares tumbling 15%. The sell-off has been exacerbated by fears of an economic slowdown, with some analysts warning of a possible recession. Delta Airlines issued a profit warning, citing heightened economic uncertainty, while corporate leaders from industries such as airlines and retail have voiced concerns over rising costs and reduced consumer spending due to the tariffs. Despite the market turmoil, Trump has dismissed the significance of stock market performance, stating that the administration remains committed to its tariff policies, which it argues are designed to protect American workers.