Trump imposed on us not just the biggest tax increase in US history, but a tax increase that will be disproportionately paid by lower and middle income people. In case you are not yet aware, these are not random market fluctuations. Trump's tariffs that average +20% overall are bigger than the Smoot Harley tariffs that caused the Great Depression. The immediate market drop happened because of the historical parallels. The total market drop of the S&P in the last 2 days is 10% of market cap. But because of Recency Bias and/or ignorance of history, some people will need to see this play out. And so every day that people hear the news of another country retaliating against US tariffs, there is likely to be more market drops in reaction. Also, when we hear the actual news about lower earnings and fewer exports and more layoffs (e.g Stellantis) and higher prices.
https://en.wikipedia.org/wiki/Smoot%E2%80%93Hawley_Tariff_Act