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.
He is definitely speeding up the inevitable collapse of the U.S. Empire. That is also just the simple fact that the capitalists are running out of ways to sustain their growth so more social spending cuts, stoking foreign conflict, and satiating public demand for a scapegoat is in order.
The thing is though, all of those things will simultaneously increase distrust and alienation when the problems don’t go away.