Earlier quoted context omitted.
It looks like it was under control for a while following World War II, but then from the early 1980s, it's hard for me not correlate the first derivative of the slope of that graph with presidential party.
What do you specifically see? I see two big increases in debt, both due to shocks (the 08 financial crisis, and the pandemic; one under Obama, and one under Trump.). Pre 2008, it does look like moderate increases under Reagan/Bush1 and Bush 2, and flat to decrease under Clinton, is that what you mean?
I recommend the surplus/deficit by GDP graph, which is easier than manually eyeballing slopes: https://fred.stlouisfed.org/series/FYFSGDA188S