美股全线暴跌，发生了什么？

Group 1 - The U.S. stock market experienced a significant decline, with major indices falling sharply, including the Nasdaq dropping over 3%, marking its largest single-day decline since April [1][2] - Large-cap tech stocks were heavily impacted, with notable declines in companies such as TSMC ADR down over 6%, and Tesla, Nvidia, and Amazon all falling more than 4% [4] - Chinese concept stocks also suffered, with the Nasdaq Golden Dragon China Index dropping over 6%, and companies like Futu Holdings and NIO seeing declines exceeding 10% [5] Group 2 - The global financial markets faced widespread sell-offs, with the Dow Jones Industrial Average plunging over 880 points at one point, closing down 1.9% [2] - European markets also experienced declines, with the Euro Stoxx 50 Index falling 1.75% and major indices in Germany, France, and Italy dropping over 1% [5] - Commodities such as oil and cryptocurrencies were severely affected, with WTI crude oil falling over 4% and Bitcoin experiencing a drop of over 13% [5] Group 3 - The uncertainty in the market has led to increased demand for protective derivatives, with investors shifting towards safe-haven assets like gold and U.S. Treasuries [6] - Gold prices rose over 1%, surpassing $4000 per ounce, while the yield on the 10-year U.S. Treasury fell to 4.034% [6] Group 4 - Analysts noted that the market had built up significant profit-taking potential due to a strong performance since April, leading to expectations of a correction [7] - The U.S. government shutdown has escalated, with the Trump administration implementing large-scale permanent layoffs of federal employees, affecting thousands across multiple departments [7][8] - The Michigan Consumer Sentiment Index for October was reported at 55, the lowest since May, indicating stagnant consumer confidence amid expectations of rising unemployment and inflation [9]