The US wasn’t the dominant superpower due to cooperation or agreement or leadership, it was the result of pure technological force.
Oppenheimer, Teller, and countless nameless others at NASA and Lockheed and Boeing and DARPA.
The US built the best weapons, spy planes, launch vehicles, satellites, and communications systems, and was willing to take a no-holds-barred approach to geopolitical strategy. This led to a circumstance which it seems was unparalleled in history thus far.
Who else is able to commit such technological progress to being able to command the world order by edict?
China, perhaps, but I don’t see the next TSMC or SpaceX or OpenAI or Google starting there. Technology is the name of the game. (My own personal take is that mass scale reusable rockets is the key strategic piece to geopolitical dominance over the next 50-100 years, with perhaps the ability to effectively integrate AI as an alternate or close second.)
It may be that we never see a monolithic superpower of the same kind again for generations. The post ww2 world order was really very very kind to the USA.