By clinging to American primacy through force and intimidation, Donald Trump is, ironically, undermining US global power. A saboteur trying to subvert US interests from the inside could hardly do better than what he’s accomplished through sheer incompetence.
Personal profit and national profit are different things. Sometimes it’s more profitable to have a larger share of a smaller pie; this is how the Putin model of dictatorship operates. It’s also why, counterintuitively, oligarchs benefit from recessions more than strong economies.