It was decided in the 2008 banking crisis that after the horrific effects of cutting off the money supply in 1929, leading to crushing deflation and Hitler's rise to power, culminating in WWII. America would never again cut off the money supply in response to financial crisis.
In 2008 America with the dollar as the worlds reserve currency, would respond to crisis by adding to the money supply. 800 billion was added to reserves.
So in March 2020 after 2 months of Trump lying about Covid he declared a national Emergency and The Federal reserve directed the Treasury to add 6.1 Trillion dollars to the banking system. Thus setting in motion the desired effect of inflation over deflation.
Trump added another 2.6 trillion and Biden piled on with 3.8 trillion.
The result was a spike in inflation to 9% a boom in the stock market and soaring real estate values. these effects have been felt around the world. Inflation spiked in Europe.
Biden and Harris have done a superior job in managing this crisis, Stock market at all time highs, Unemployment at 3.8%, inflation down to 2.5%, RE values stable, America's supply chain restored, interest rates falling.