Not sure why everyone pointing this out is being downvoted. But we reduced revenue (taxes) while keeping spending the same. So debt goes up.

On top of that some emergency situations have also contributed (GFC, COVID) and then and in the Iraq war.

Right now they’re proposing a budget that will reduce taxes again, and increase our debt by over $4 trillion.

Edit: seriously everyone here knows math, this is math, it is public data, why is it treated this way. Argue the substance of cutting programs, but you can’t argue that deciding to raise less tax revenue than you spend increases the debt!