President Donald Trump has overseen two of the most volatile periods in the stock market's storied history: the five-week COVID-19 crash in February-March 2020 and the week-long tariff tantrum in early April 2025.At the same time, the stock market has thrived under President Trump. The iconic Dow Jones Industrial Average (^DJI -0.34%), benchmark S&P 500 (^GSPC -1.09%), and innovation-fueled Nasdaq Composite (^IXIC -2.15%) gained 57%, 70%, and 142% during his first non-consecutive term, respectively, and hav ...