Markets around the world have wavered as fear and uncertainty over tariffs and trade wars rattle investors. The S&P 500 just recorded its worst month since 2022, shedding 5.8 percent in March.

The stock market crash of October 1929 signaled the end of the "Roaring Twenties" and the beginning of the Great Depression. This was the second day of the big drop, known as "Black Tuesday," which began one day earlier and occupies the next spot on this list. 3.) Oct. 28, 1929 (-38.33, -12.82%)

Stock markets continued to fall Friday as traders reacted to President Donald Trump's announced tariffs and the global response.

Investors are trying to game out how much tolerance U.S. President Donald Trump has for stock market losses after his latest tariff policies ignited a more than 10% wipeout on Wall Street, with some still holding out hope of eventual relief.

The report, that President Trump was considering a pause on his expansive tariffs, spread on social media and was amplified by CNBC and Reuters. The White House called the claim “fake news.”

Traders are bracing for another bumpy week after a day marked by waves of volatility thanks to unpredictable news on President Donald Trump’s tariff plans. US stocks swung violently, wiping out a 4% plunge to rise more than 3% before turning negative again as investors reacted to a swirl of headlines related to trade policies.