Stock futures dropped on Wednesday as Wall Street reacted to the start of a U.S. government shutdown, fueling concerns over delayed economic data and rising uncertainty for investors. Dow futures slid more than 230 points, while S&P 500 and Nasdaq futures also traded lower, signaling a shaky open for U.S. markets. Why Stock Futures Are FallingMarkets are under pressure as lawmakers in Washington remain locked in a budget standoff that has now triggered a shutdown. Federal Reserve communication – The central bank may need to adjust its outlook if it lacks real-time economic data. The Bottom LineStock futures are signaling renewed anxiety as the shutdown begins, highlighting the political risks weighing on Wall Street.