Which 2020 event caused a record one-day percentage fall in the Dow Jones before a rapid rebound?

The COVID-19 pandemic caused a record one-day percentage fall in the Dow Jones before a rapid rebound.

The 2020 stock-market crash began as investors assessed the economic effects of the novel coronavirus spreading internationally. Travel restrictions, business closures, supply disruptions, and uncertainty about public-health measures caused markets to fall sharply in February and March.

On March 16, 2020, the Dow Jones Industrial Average fell 12.93%, its largest one-day percentage decline since the 1987 crash. Trading was halted several times by circuit breakers during the turmoil. Extraordinary fiscal support, central-bank action, and hopes for vaccines helped markets recover later in 2020.

The crash is sometimes called the Coronavirus Crash. It differed from the 2008 crisis because its initial trigger was a public-health emergency rather than the failure of mortgage-credit markets.