It didn’t start with Biden. Dumbya bears a lot of the blame as well.
Starting in 2008 after he was elected Ubama pushed through 4 rounds of QE over the next 6 years at $1 Trillion apiece. He (Fed) paid half to buy T-bills to legitimize the Trillion he was gonna spend and half to buy Mortgage Backed Securities (replacing worthless Credit Derivatives) to save the ‘housing industry’ after his House Finance Committee forced banks to loan money to people who could never afford a home.
After this, Trillion dollar deficits became de rigueur.