> IMF keeps the global south in debt entrapment with structural adjustment programs designed to prevent development. etc. etc. we never really left them alone

Countries invite IMF assistance. If they wanted to be left alone, all they have to do is do nothing. If IMF loans didn't have strings attached, they wouldn't be able to borrow money, as it's those strings which build bond investor confidence. The entire point of IMF assistance is to avoid being cutoff from international borrowing for being horrible credit risks (again).

The root cause of national debt problems is primarily government corruption, but also mismanagement, often at the behest of populist politics that excuse economic policy failures by, e.g., scapegoating outside forces. The US isn't immune to this problem, either, it just happens that the US had, albeit intermittently, long enough runs of solid financial management (e.g. Hamilton during the Founding) that it could grow an economic base that could withstand intermittent periods of mismanagement without the entire economy collapsing (yet).

Even when a country is dealt a really crappy hand at the outset, it's not irreversible. Haiti is the poster child for crushing debt unfairly imposed by foreign powers, yet the Dominican Republic had the same history, but managed to overcome it. In some instances, interventions blamed for keeping Haiti oppressed were precisely what helped the Dominican Republic flourish. Likewise, nobody hears about the IMF success stories, just the failures; and it's not because the former don't exist or are rare.