What happened in 1987's 'Black Monday' market crash?

Following US President Donald Trump's tariffs, CNBC host Jim Cramer predicted a market blood bath that could expand into a crash similar to 1987's 'Black Monday'. The global financial crisis saw the Dow Jones Industrial Average (DJIA) dropping 22.6% in a single trading session. It's "a loss that remains the largest one-day stock market decline in history", according to FederalHistoryReserve.org.