The S&P 500 ended a nine-day winning streak, its longest in over 20 years, as it fell 0.6% on Monday. The Dow Jones Industrial Average also declined by 0.2%, marking the end of a similar nine-day upward trend for both indices. This downturn coincided with oil prices hitting a four-year low after the OPEC+ group announced plans to increase output. The downturn in the stock market was influenced by several factors, including President Donald Trump's call for a 100% tariff on foreign-made films, which added to trade war concerns. Investors were also awaiting the Federal Reserve's upcoming monetary policy decision. Additionally, the US March trade deficit reached $1,405 billion, higher than the estimated $1,372 billion. At the market open on Monday, the S&P 500 was down 51.09 points or 0.90% at 5,599.29, the Dow Jones fell 342.07 points or 0.83% to 40,876.76, and the Nasdaq dropped 209.22 points or 1.17% to 17,635.02. Later in the day, losses were slightly reduced with the S&P 500 down 0.2%, Nasdaq down 0.3%, and Dow down 0.3%. The market's decline was also affected by waning AI mania and companies revising down their profit forecasts due to uncertainty from Trump's tariffs.