US stock market crashes today. The Dow Jones fell 261 points to 49,364. The S&P 500 dropped 0.29% to 6,889. The Nasdaq slid 0.44% to 22,786. Investors reacted fast after President Trump raised global tariffs to 15%. Trade fears returned. Inflation worries increased. Gold jumped 2%. Bitcoin fell below $66,000. Wall Street volatility is back as tariff uncertainty shakes markets again.