Stock market today: Dow plummets 800 points, S&P 500, Nasdaq sink over 2% as Trump's Greenland threats clobber stocks

Market Overview - US stocks experienced a significant decline, marking Wall Street's worst day since October, primarily driven by renewed trade tensions initiated by President Trump regarding Greenland [1] - The Dow Jones Industrial Average fell by 1.8%, losing over 800 points, while the S&P 500 and Nasdaq Composite dropped approximately 2% and 2.4% respectively, erasing year-to-date gains for both indices [2] Trade Tensions - President Trump announced that eight NATO countries would face an additional 10% import duty unless a deal regarding Greenland was reached, intensifying trade war fears [3] - The EU is considering $108 billion in retaliatory tariffs against the US, with potential implications for US assets amounting to $8 trillion due to an "anti-coercion instrument" [3] Sector Impact - The technology sector faced pressure, with major companies like Nvidia and Broadcom leading declines as investors shifted away from AI-linked equities, raising concerns about a market bubble [4] - Treasury yields reached their highest levels in four months, influenced by a sell-off in Japanese bonds, while the dollar fell to a two-week low amid a "Sell America" trend [4] Upcoming Events - Attention is shifting to the World Economic Forum in Davos, where President Trump is expected to address the Greenland situation and engage in discussions with other nations [5] - Investors are preparing for a busy earnings season, with Netflix set to report results after market close, having recently amended its bid for Warner Bros. Discovery's studio to an all-cash offer [5]