美股大幅下挫，美债价格暴跌，美金融市场经历“最惨烈一天”

Core Viewpoint - The article discusses a significant sell-off of U.S. assets, driven by rising tensions between President Trump and European leaders over Greenland, leading to a sharp decline in U.S. stock markets and a drop in the dollar index, marking the largest single-day losses since April of the previous year [1][2]. Group 1: Market Reactions - On the day of the sell-off, the Nasdaq Composite Index fell over 2.4%, the Dow Jones Industrial Average dropped 1.7%, and the S&P 500 Index decreased by approximately 2.1%, resulting in a market capitalization loss exceeding $1.2 trillion, erasing all gains for the year [1]. - The dollar index experienced a nearly 1% decline, the largest single-day drop since the implementation of significant tariffs by the Trump administration in April of the previous year [1]. Group 2: Bond Market and Gold Prices - The 10-year U.S. Treasury yield rose to its highest level since August of the previous year, increasing by 6.4 basis points, while the 30-year Treasury yield climbed 8.1 basis points to 4.920%, marking the largest single-day increase since July [2]. - Gold prices saw significant volatility, with both international gold futures and spot prices reaching new highs, briefly surpassing $4,800 per ounce [2]. Group 3: Investor Sentiment and Future Outlook - The sell-off is viewed as a response to increasing global risk aversion, with investors seeking to reduce their exposure to the volatile and unreliable U.S. market [2]. - Analysts suggest that unless there is a major economic boom, the market may have fully priced in expectations of "American exceptionalism," leading to a potential shift towards diversification in investment strategies [2]. - The long-term impact on the dollar and other U.S. assets could be severe if President Trump does not retract his plans or fails to reach a compromise [2].