On March 18, 2020, local time, the US stock market experienced a circuit breaker for the fifth time in history, setting a historical record of four circuit breakers in 10 days. Compared with the historical high in February, the Dow Jones Industrial Average fell by 10,000 points in 24 days. At this point, the stock market performance that US President Trump once talked about was "melted out."

Before the opening of trading on the 18th, all three major U.S. stock index futures fell sharply and hit trading restrictions. U.S. stocks continued to fall after opening lower, with the S&P 500 index reaching 7% during the session, triggering the circuit breaker mechanism. This is the fourth time in 10 days that the U.S. stock market has shut down, and the fifth time in history.

On the 18th, the U.S. stock market continued to weaken after the circuit breaker resumed trading. The Dow Jones Industrial Average fell below the 19,000-point mark during the session, once falling nearly 11%, falling more than 2,200 points, with the lowest reading at 18,917.46 points. Compared with the historical record in February The high point was 29568.57 points, and the price fell by more than 10,000 points. The Nasdaq once fell nearly 9%, and the S&P 500 index once fell nearly 10%.