I think if USA wanted to step anywhere, they would be doing it by now by military or covered operations alike.
They don't really need a real reason to step anywhere in case they can create a reason themselves, like the case with the vietnam war.
As for non military ways to fuck up a country, take the cases with guatemala, iran, chile congo, cuba (ofc the bay of pigs failed) or operation phoenix in vietnam and get an idea of what the real policy and purpose of CIA was.
My two cents about the US