I must respectfully disagree...
As I read scripture, the world system, including all nations, is satan's kingdom... Each subsidiary nation-state is a fiefdom of satan.
The US is clearly and certainly one of the largest and worst of these evil empires, but not the entire thing.
https://peakd.com/library/@creatr/the-kingdom-of-jesus-god-the-heavens-my-library-shelf