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.
It really illustrates how the decline is self reinforcing in nature. As material conditions get worse, people become more disillusioned, opening the door to opportunists like Trump, who in turn accelerate the whole process.